January 2024 - ffmpeg-user - lists.ffmpeg.org

How to use the ffmpeg to real-time base TS analyze ?
by Nandor Nemoda 15 Jan '24

15 Jan '24

Hi All, I would like to ask your expert help with my goal. I have a *PCI* broadcast video card and want to check the sent and received transport stream (*real-time*). Specifically, I want to know if there were any signal losses and, if so, when did they occur. I don't need a lot of videos to encode/decode options at the moment, just a simple test to see if there were any issues during a one-hour period. Can you write a little example or commands& parameters that I should use to achieve this target? Many thanks to everyone who can assist me. :) Br, Peter

2 1

2 or maybe 3 trimming bugs
by Mark Filipak 15 Jan '24

15 Jan '24

Interested and knowledgeable folks, please confirm my results prior to trac submission. I'd like to know what happens in other use-cases. If you want this video, I could make a shortened version that would allow testing of the front trim, and we could figure out how to get it to you. Thanks --Mark. set SOURCE=h:\BDMV\STREAM\00305.m2ts set TARGET=c:\FANNY AND ALEXANDER [1982(1983)] 1of4.m2ts : This is the Windows cmd script that made the target. : Issues: : 1. : 59 bogus packets are made in the target preceding frame 481: 58 audio : and frame 480, plus one that follows frame 134046: frame 134048. Note: : Even if I made a mistake placing the trim, bogus packets shouldn't be : there. Note that video timebase == audio timebase. : Clue: The bogus end frame's DTS == the valid end frame's PTS. : 2. : Something actually changes this bogus audio packet: : 1, 2798640, 2798640, 960, 1084, 0xe54d2b6f : to this: : 1, 2798640, 2798640, 960, 60, 0xec16103f : Granted, it's silent audio, but how could a remux delete 1024 bytes? : Note: That's exactly 1 disc sector. : -Begin- : Determine '-ss' and '-to' : start -- MPV says to start at 0:20.062 sec -- MPV rounds. : (20.062 sec)*(24/1.001 fps) = 481.[006993..] frames, i.e., 0..480 : (frame 481)/(24/1.001 fps) = 20.061708[3..] sec : end -- MPV says to end at 1:33:10.835 (i.e., 5590.835 sec) -- MPV rounds. : (5590.835 sec)*(24/1.001 fps) = 134045.[994005..] frames, i.e., 481..134046 : (frame 134046)/(24/1.001 fps) = 5590.83525[0..] sec set TRIM=-framespan 481..134046 ...gee, this would be simple set TRIM=-ss 20.061708333 -to 5590.83525 : PTS = 2854113.75[0..]..504223732.5[0..] set CODE=-c copy -sn -dn ffmpeg %TRIM% -copyts -i %SOURCE% -map 0 %CODE% -muxdelay 0 "%TARGET%" pause exit Tip: Highlight the 6 fields and search on them to switch back-n-forth. The source. ffmpeg -i %SOURCE% -map 0 -copyts -c copy -f framecrc - --------------------starts--------------------- in this video, '0': video, '1': audio, '2': subtitles / DTS PTS dur bytes crc 0, 1044806, 1048560, 3753, 640646, 0x900a1a7a 0 0, 1048560, 1056067, 3753, 640646, 0xe5c6cd7c 2 1, 1048560, 1048560, 960, 1084, 0xe54d2b6f 1, 1049520, 1049520, 960, 1084, 0xe54d2b6f 1, 1050480, 1050480, 960, 1084, 0xe54d2b6f 1, 1051440, 1051440, 960, 1084, 0xe54d2b6f 0, 1052313, 1052313, 3753, 640646, 0xe7f0c204 1 463 more video & 1815 more audio packets here 3..465 0, 2794053, 2801561, 3753, 73475, 0x95247b28 467 1, 2794800, 2794800, 960, 1084, 0xe54d2b6f 1, 2795760, 2795760, 960, 1084, 0xe54d2b6f 1, 2796720, 2796720, 960, 1084, 0xe54d2b6f 1, 2797680, 2797680, 960, 1084, 0xe54d2b6f 0, 2797807, 2797807, 3753, 66185, 0xffbb475c 466 1, 2798640, 2798640, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2799600, 2799600, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2800560, 2800560, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2801520, 2801520, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2801561, 2809068, 3753, 68631, 0x23461eb7 469 1, 2802480, 2802480, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2803440, 2803440, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2804400, 2804400, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2805315, 2805315, 3753, 60778, 0x9e687e73 468 1, 2805360, 2805360, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2806320, 2806320, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2807280, 2807280, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2808240, 2808240, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2809068, 2816576, 3753, 61104, 0x2eda8064 471 1, 2809200, 2809200, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2810160, 2810160, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2811120, 2811120, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2812080, 2812080, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2812822, 2812822, 3753, 56227, 0xdea54c0e 470 1, 2813040, 2813040, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2814000, 2814000, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2814960, 2814960, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2815920, 2815920, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2816576, 2824083, 3753, 51687, 0xcace633b 473 1, 2816880, 2816880, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2817840, 2817840, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2818800, 2818800, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2819760, 2819760, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2820330, 2820330, 3753, 50741, 0x3f745fcc 472 1, 2820720, 2820720, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2821680, 2821680, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2822640, 2822640, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2823600, 2823600, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2824083, 2835345, 3753, 32612, 0x84e2722c 476 1, 2824560, 2824560, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2825520, 2825520, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2826480, 2826480, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2827440, 2827440, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2827837, 2827837, 3753, 41799, 0x58c2c17c 474 1, 2828400, 2828400, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2829360, 2829360, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2830320, 2830320, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2831280, 2831280, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2831591, 2831591, 3753, 35986, 0x0859e6ae 475 1, 2832240, 2832240, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2833200, 2833200, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2834160, 2834160, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2835120, 2835120, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2835345, 2846606, 3753, 12050, 0x02bb34c9 479 1, 2836080, 2836080, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2837040, 2837040, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2838000, 2838000, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2838960, 2838960, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2839098, 2839098, 3753, 25719, 0x6f77b9b6 477 1, 2839920, 2839920, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2840880, 2840880, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2841840, 2841840, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2842800, 2842800, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2842852, 2842852, 3753, 22455, 0xaa9655b8 478 1, 2843760, 2843760, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2844720, 2844720, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2845680, 2845680, 960, 1084, 0xe54d2b6f <== makes bogus +-----------------------------------------------------------------------+ ¦ 0, 2846606, 2854113, 3753, 640646, 0x3a5a0c45 <== copy 481 ¦ +-----------------------------------------------------------------------+ 1, 2846640, 2846640, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2847600, 2847600, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2848560, 2848560, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2849520, 2849520, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2850360, 2850360, 3753, 640646, 0xfed1d09a <== makes bogus 480 1, 2850480, 2850480, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2851440, 2851440, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2852400, 2852400, 960, 1084, 0xe54d2b6f <== makes bogus 1, 2853360, 2853360, 960, 1084, 0xe54d2b6f <== makes bogus 0, 2854113, 2861621, 3753, 640646, 0x02208727 <== copy 483 1, 2854320, 2854320, 960, 1084, 0xe54d2b6f <== copy 1, 2855280, 2855280, 960, 1084, 0xe54d2b6f <== copy 1, 2856240, 2856240, 960, 1084, 0xe54d2b6f <== copy 1, 2857200, 2857200, 960, 1084, 0xe54d2b6f <== copy 0, 2857867, 2857867, 3753, 640646, 0x108abb16 <== copy 482 -------------------continues------------------- 0, 504212471, 504212471, 3753, 578, 0x415815b3 <== copy 134043 1, 504213360, 504213360, 960, 1400, 0x8bdea5c1 <== copy 1, 504214320, 504214320, 960, 1396, 0xeff0a5d0 <== copy 1, 504215280, 504215280, 960, 1400, 0x2457b15f <== copy +--------------------------------------------------------------------------+ ¦ 0, 504216225, 504223732, 3753, 640646, 0x23141ebc <== copy 134046 ¦ +--------------------------------------------------------------------------+ 1, 504216240, 504216240, 960, 1396, 0x0c5ba512 <== copy 1, 504217200, 504217200, 960, 1392, 0xc090a40f <== copy 1, 504218160, 504218160, 960, 1408, 0xd071b6bd <== copy 1, 504219120, 504219120, 960, 1400, 0xdffda506 <== copy 0, 504219978, 504219978, 3753, 640646, 0x5ef78a61 <== copy 134045 1, 504220080, 504220080, 960, 1392, 0x90a09e3a <== copy 1, 504221040, 504221040, 960, 1400, 0xffdfa198 <== copy 1, 504222000, 504222000, 960, 1400, 0x5eed993b <== copy 1, 504222960, 504222960, 960, 1392, 0x102da26e <== copy 0, 504223732, 504231240, 3753, 640646, 0x31a0cd7f <== makes bogus 134048 1, 504223920, 504223920, 960, 1392, 0xe1e7a692 1, 504224880, 504224880, 960, 1392, 0xb6f6b094 1, 504225840, 504225840, 960, 1404, 0x7793971b 1, 504226800, 504226800, 960, 1400, 0x2270a846 0, 504227486, 504227486, 3753, 640646, 0xfb0ec7ee 134047 ---------------continues-to-end---------------- The target. ffmpeg -i %TARGET% -map 0 -copyts -c copy -f framecrc - --------------------starts--------------------- in this copy, '0': video, '1': audio / DTS PTS dur bytes crc 1, 2798640, 2798640, 960, 60, 0xec16103f <== bogus *changes* 1, 2799600, 2799600, 960, 1084, 0xe54d2b6f <== bogus 1, 2800560, 2800560, 960, 1084, 0xe54d2b6f <== bogus 1, 2801520, 2801520, 960, 1084, 0xe54d2b6f <== bogus 1, 2802480, 2802480, 960, 1084, 0xe54d2b6f <== bogus 1, 2803440, 2803440, 960, 1084, 0xe54d2b6f <== bogus 1, 2804400, 2804400, 960, 1084, 0xe54d2b6f <== bogus 1, 2805360, 2805360, 960, 1084, 0xe54d2b6f <== bogus 1, 2806320, 2806320, 960, 1084, 0xe54d2b6f <== bogus 1, 2807280, 2807280, 960, 1084, 0xe54d2b6f <== bogus 1, 2808240, 2808240, 960, 1084, 0xe54d2b6f <== bogus 1, 2809200, 2809200, 960, 1084, 0xe54d2b6f <== bogus 1, 2810160, 2810160, 960, 1084, 0xe54d2b6f <== bogus 1, 2811120, 2811120, 960, 1084, 0xe54d2b6f <== bogus 1, 2812080, 2812080, 960, 1084, 0xe54d2b6f <== bogus 1, 2813040, 2813040, 960, 1084, 0xe54d2b6f <== bogus 1, 2814000, 2814000, 960, 1084, 0xe54d2b6f <== bogus 1, 2814960, 2814960, 960, 1084, 0xe54d2b6f <== bogus 1, 2815920, 2815920, 960, 1084, 0xe54d2b6f <== bogus 1, 2816880, 2816880, 960, 1084, 0xe54d2b6f <== bogus 1, 2817840, 2817840, 960, 1084, 0xe54d2b6f <== bogus 1, 2818800, 2818800, 960, 1084, 0xe54d2b6f <== bogus 1, 2819760, 2819760, 960, 1084, 0xe54d2b6f <== bogus 1, 2820720, 2820720, 960, 1084, 0xe54d2b6f <== bogus 1, 2821680, 2821680, 960, 1084, 0xe54d2b6f <== bogus 1, 2822640, 2822640, 960, 1084, 0xe54d2b6f <== bogus 1, 2823600, 2823600, 960, 1084, 0xe54d2b6f <== bogus 1, 2824560, 2824560, 960, 1084, 0xe54d2b6f <== bogus 1, 2825520, 2825520, 960, 1084, 0xe54d2b6f <== bogus 1, 2826480, 2826480, 960, 1084, 0xe54d2b6f <== bogus 1, 2827440, 2827440, 960, 1084, 0xe54d2b6f <== bogus 1, 2828400, 2828400, 960, 1084, 0xe54d2b6f <== bogus 1, 2829360, 2829360, 960, 1084, 0xe54d2b6f <== bogus 1, 2830320, 2830320, 960, 1084, 0xe54d2b6f <== bogus 1, 2831280, 2831280, 960, 1084, 0xe54d2b6f <== bogus 1, 2832240, 2832240, 960, 1084, 0xe54d2b6f <== bogus 1, 2833200, 2833200, 960, 1084, 0xe54d2b6f <== bogus 1, 2834160, 2834160, 960, 1084, 0xe54d2b6f <== bogus 1, 2835120, 2835120, 960, 1084, 0xe54d2b6f <== bogus 1, 2836080, 2836080, 960, 1084, 0xe54d2b6f <== bogus 1, 2837040, 2837040, 960, 1084, 0xe54d2b6f <== bogus 1, 2838000, 2838000, 960, 1084, 0xe54d2b6f <== bogus 1, 2838960, 2838960, 960, 1084, 0xe54d2b6f <== bogus 1, 2839920, 2839920, 960, 1084, 0xe54d2b6f <== bogus 1, 2840880, 2840880, 960, 1084, 0xe54d2b6f <== bogus 1, 2841840, 2841840, 960, 1084, 0xe54d2b6f <== bogus 1, 2842800, 2842800, 960, 1084, 0xe54d2b6f <== bogus 1, 2843760, 2843760, 960, 1084, 0xe54d2b6f <== bogus 1, 2844720, 2844720, 960, 1084, 0xe54d2b6f <== bogus 1, 2845680, 2845680, 960, 1084, 0xe54d2b6f <== bogus +-----------------------------------------------------------------------+ ¦ 0, 2846606, 2854113, 3753, 640646, 0x3a5a0c45 <== copy 481 ¦ +-----------------------------------------------------------------------+ 1, 2846640, 2846640, 960, 1084, 0xe54d2b6f <== bogus 1, 2847600, 2847600, 960, 1084, 0xe54d2b6f <== bogus 1, 2848560, 2848560, 960, 1084, 0xe54d2b6f <== bogus 1, 2849520, 2849520, 960, 1084, 0xe54d2b6f <== bogus 0, 2850360, 2850360, 3753, 640646, 0xfed1d09a <== bogus 480 1, 2850480, 2850480, 960, 1084, 0xe54d2b6f <== bogus 1, 2851440, 2851440, 960, 1084, 0xe54d2b6f <== bogus 1, 2852400, 2852400, 960, 1084, 0xe54d2b6f <== bogus 1, 2853360, 2853360, 960, 1084, 0xe54d2b6f <== bogus 0, 2854113, 2861621, 3753, 640646, 0x02208727 483 1, 2854320, 2854320, 960, 1084, 0xe54d2b6f 1, 2855280, 2855280, 960, 1084, 0xe54d2b6f 1, 2856240, 2856240, 960, 1084, 0xe54d2b6f 1, 2857200, 2857200, 960, 1084, 0xe54d2b6f 0, 2857867, 2857867, 3753, 640646, 0x108abb16 482 -------------------continues------------------- 0, 504212471, 504212471, 3753, 578, 0x415815b3 134043 1, 504213360, 504213360, 960, 1400, 0x8bdea5c1 1, 504214320, 504214320, 960, 1396, 0xeff0a5d0 1, 504215280, 504215280, 960, 1400, 0x2457b15f +--------------------------------------------------------------------------+ ¦ 0, 504216225, 504223732, 3753, 640646, 0x23141ebc 134046 ¦ +--------------------------------------------------------------------------+ 1, 504216240, 504216240, 960, 1396, 0x0c5ba512 1, 504217200, 504217200, 960, 1392, 0xc090a40f 1, 504218160, 504218160, 960, 1408, 0xd071b6bd 1, 504219120, 504219120, 960, 1400, 0xdffda506 0, 504219978, 504219978, 3753, 640646, 0x5ef78a61 134045 1, 504220080, 504220080, 960, 1392, 0x90a09e3a 1, 504221040, 504221040, 960, 1400, 0xffdfa198 1, 504222000, 504222000, 960, 1400, 0x5eed993b 1, 504222960, 504222960, 960, 1392, 0x102da26e 0, 504223732, 504231240, 3753, 640646, 0x31a0cd7f <== bogus 134048 ---------------------ends----------------------

1 1

'-t' versus '-to'
by Mark Filipak 14 Jan '24

14 Jan '24

What's the difference? -t duration (input/output) When used as an input option (before -i), limit the duration of data read from the input file. When used as an output option (before an output url), stop writing the output after its duration reaches duration. duration must be a time duration specification, see (ffmpeg-utils)the Time duration section in the ffmpeg-utils(1) manual. -to and -t are mutually exclusive and -t has priority. -to position (input/output) Stop writing the output or reading the input at position. position must be a time duration specification, see (ffmpeg-utils)the Time duration section in the ffmpeg-utils(1) manual. -to and -t are mutually exclusive and -t has priority. 'duration' and 'position' seem to both be duration. What's the difference? --Mark.

5 7

cutting mp4 with ffmpeg
by Andrew Randrianasulu 14 Jan '24

14 Jan '24

I compiled new ffmpeg I tried to cut mp4 -to parameter was coming from mpv: bash-5.1$ mpv ~/6029.mp4 (+) Video --vid=1 (*) (h264 720x400 25.000fps) (+) Audio --aid=1 (*) (aac 2ch 48000Hz) AO: [alsa] 48000Hz stereo 2ch float VO: [gpu] 720x400 yuv420p (Paused) AV: 00:01:04.600 / 01:28:31.600 (1%) A-V: 0.000 1 min + 4 seconds +0.600 milliseconds = 64.600 ? bash-5.1$ /dev/shm/ffmpeg/ffmpeg -i ~/6029.mp4 -copyts -c:v copy -c:a copy -ss 0.0 -to 64.600 /dev/shm/6029_cut.mp4 ffmpeg version N-112149-ga87a52ed0b Copyright (c) 2000-2024 the FFmpeg developers built with gcc 11.2.0 (GCC) configuration: libavutil 58. 36.101 / 58. 36.101 libavcodec 60. 37.100 / 60. 37.100 libavformat 60. 20.100 / 60. 20.100 libavdevice 60. 4.100 / 60. 4.100 libavfilter 9. 17.100 / 9. 17.100 libswscale 7. 6.100 / 7. 6.100 libswresample 4. 13.100 / 4. 13.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/guest/6029.mp4': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42isomavc1 creation_time : 2011-06-24T09:52:37.000000Z encoder : HandBrake 0.9.5 2011043000 Duration: 01:28:31.60, start: 0.000000, bitrate: 789 kb/s Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709, progressive), 720x400, 657 kb/s, 25 fps, 25 tbr, 90k tbn (default) Metadata: creation_time : 2011-06-24T09:52:37.000000Z vendor_id : [0][0][0][0] encoder : JVT/AVC Coding Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default) Metadata: creation_time : 2011-06-24T09:52:37.000000Z vendor_id : [0][0][0][0] Stream mapping: Stream #0:0 -> #0:0 (copy) Stream #0:1 -> #0:1 (copy) Output #0, mp4, to '/dev/shm/6029_cut.mp4': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42isomavc1 encoder : Lavf60.20.100 Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709, progressive), 720x400, q=2-31, 657 kb/s, 25 fps, 25 tbr, 90k tbn (default) Metadata: creation_time : 2011-06-24T09:52:37.000000Z vendor_id : [0][0][0][0] encoder : JVT/AVC Coding Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default) Metadata: creation_time : 2011-06-24T09:52:37.000000Z vendor_id : [0][0][0][0] Press [q] to stop, [?] for help [out#0/mp4 @ 0xb79c180] video:5397kB audio:1009kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.732907% size= 6453kB time=01:17:29.80 bitrate= 11.4kbits/s speed=1.21e+03x bash-5.1$ MP4Box -info /dev/shm/6029_cut.mp4 * Movie Info * Timescale 1000 - 2 tracks Computed Duration 00:01:04.800 - Indicated Duration 00:01:04.800 Fragmented File: no File Brand isom - version 512 Compatible brands: isom iso2 avc1 mp41 Created: UNKNOWN DATE Modified: UNKNOWN DATE File has no MPEG4 IOD/OD iTunes Info: Encoder Software: Lavf60.20.100 1 UDTA types: meta (1) Track # 1 Info - TrackID 1 - TimeScale 90000 Media Duration 00:01:00.040 - Indicated Duration 00:01:00.160 Track has 2 edit lists: track duration is 00:01:04.800 Media Info: Language "Undetermined (und)" - Type "vide:avc1" - 1501 samples Visual Sample Entry Info: width=720 height=400 (depth=24 bits) Visual Track layout: x=0 y=0 width=720 height=400 MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21 AVC/H264 Video - Visual Size 720 x 400 AVC Info: 1 SPS - 1 PPS - Profile High @ Level 3 NAL Unit length bits: 32 Chroma format YUV 4:2:0 - Luma bit depth 8 - chroma bit depth 8 SPS#1 hash: E2ADECEA8531A9FC07EE08593AF65A2AD75A3533 PPS#1 hash: 6BBE60BFBE383CE9144FA78B782534A704912778 Self-synchronized RFC6381 Codec Parameters: avc1.64001E Average GOP length: 250 samples Max sample duration: 3600 / 90000 Track # 2 Info - TrackID 2 - TimeScale 48000 Media Duration 00:01:04.618 - Indicated Duration 00:01:04.618 Track has 1 edit lists: track duration is 00:01:04.619 Media Info: Language "Undetermined (und)" - Type "soun:mp4a" - 3029 samples MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40 MPEG-4 Audio AAC LC (AOT=2 implicit) - 2 Channel(s) - SampleRate 48000 Synchronized on stream 1 RFC6381 Codec Parameters: mp4a.40.2 Alternate Group ID 1 All samples are sync Max sample duration: 1024 / 48000 bash-5.1$ /dev/shm/ffmpeg/ffprobe /dev/shm/6029_cut.mp4 ffprobe version N-112149-ga87a52ed0b Copyright (c) 2007-2024 the FFmpeg developers built with gcc 11.2.0 (GCC) configuration: libavutil 58. 36.101 / 58. 36.101 libavcodec 60. 37.100 / 60. 37.100 libavformat 60. 20.100 / 60. 20.100 libavdevice 60. 4.100 / 60. 4.100 libavfilter 9. 17.100 / 9. 17.100 libswscale 7. 6.100 / 7. 6.100 libswresample 4. 13.100 / 4. 13.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/dev/shm/6029_cut.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf60.20.100 Duration: 00:01:04.68, start: 0.000000, bitrate: 817 kb/s Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709, progressive), 720x400, 736 kb/s, 25 fps, 25 tbr, 90k tbn (default) Metadata: handler_name : VideoHandler vendor_id : [0][0][0][0] encoder : JVT/AVC Coding Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0] ===== MB4Box from gpac 1.01. compiled without ffmpeg support. but even ffprobe says: Duration: 00:01:04.68 - so we have 80 milliseconds of difference from target? MB4Box seems to say: Computed Duration 00:01:04.800 - Indicated Duration 00:01:04.800 but for audio track Media Duration 00:01:04.618 - Indicated Duration 00:01:04.618 Track has 1 edit lists: track duration is 00:01:04.619 so, they all a bit differ ....

4 12

split from Mark's trimming thread
by Andrew Randrianasulu 13 Jan '24

13 Jan '24

I was looking into loslesscut issue tracker and found two related issues: https://github.com/mifi/lossless-cut/issues/126 " Implement "smart cut" this branches into avcut and its explanation, and into https://github.com/mifi/lossless-cut/issues/1216 "How to seek to and cut from a frame in ffmpeg?" this discussion has interesting tip on how to convince ffmpeg to cut more accurately on keyframes: ===== The only good solution and reproducible that I found it to set the -t to 2 frames before the keyframe wanted ==== So I wonder if *this* will work with Mark's files? I tried ffmpeg's ss and to options on mp4 file and get around 3 milliseconds of difference between cut file and distance I tried to express in milliseconds argument for " -to" switch from ss 0.0. For finding keyframes I was using mpv's default seeking behavior {keyboard cursor arrows will jump to keyframe} with osd-fractions option set in mpv.conf so it displays milliseconds in both terminal output and OSD but it was with v 4.4.4 of ffmpeg, so may be not reproducible on new ffmpeg versions. I want to thank Mark for his persistence in chasing this issue because it turned out many open- and closed-source projects use ffmpeg/libav* for framecut functionality, so fixing it at source is important.

1 0

Force target DTS == source DTS -- How?
by Mark Filipak 12 Jan '24

12 Jan '24

Question: How can I force the target's DTS to be the source's DTS? I'm simply demuxing and remuxing. To make the targets: set FORCE=-bsf:v setts=dts=DTS:pts=PTS set SOURCE=h:\BDMV\STREAM\00305.m2ts : IS: 0, 1044806, 1048560, 3753, 640646, 0x900a1a7a, S=1, 1 ffmpeg -to 39.122 -i %SOURCE% -map 0 -c copy -sn -dn c:\target_1.m2ts : RESULT: 0, 126000, 129754, 3753, 640646, 0x900a1a7a, S=1, 1 ffmpeg -to 39.122 -i %SOURCE% -map 0 %FORCE% -c copy -sn -dn c:\target_2.m2ts : RESULT: 0, 126000, 129754, 3753, 640646, 0x900a1a7a, S=1, 1 Thanks, Mark.

3 10

Best way convert to mpg
by Budi Janto 11 Jan '24

11 Jan '24

Hi, In last week I tried to convert *.dat, *.avi and other video format to *.mpg. This caused our application support only for *.mpg file (Work well). So for this required, I just convert it without any modification sound/video quality (AS-IS) for e.g: Command used to convert *.dat to *.mpg. # find * -type f -iname "*.dat" -exec sh -c 'ffmpeg -hide_banner -y -i "$0" -vcodec copy -acodec copy "${0%.dat}.mpg"' {} \; Command used to convert *.avi to *.mpg. # find * -type f -iname "*.avi" -exec sh -c 'ffmpeg -hide_banner -y -i "$0" -c:v copy -c:a copy "${0%.avi}.mpg"' {} \; But sometime, I got message something like this: [...] [mpeg @ 0x1498ec830280] Invalid timestamps stream=0, pts=27603, dts=20554804, size=2296 [mpeg @ 0x1498ec830500] Invalid DTS: 20523600 PTS: -3601 in output stream 0:0, replacing by guess [...] [...] [mpeg @ 0x1d7db2030500] Non-monotonic DTS in output stream 0:0; previous: 16050049, current: 16050049; changing to 16050050. This may result in incorrect timestamps in the output file. [mpeg @ 0x1d7db2030500] Non-monotonic DTS in output stream 0:0; previous: 16057249, current: 16057249; changing to 16057250. This may result in incorrect timestamps in the output file. [mpeg @ 0x1d7db2030500] Non-monotonic DTS in output stream 0:0; previous: 16064449, current: 16064449; changing to 16064450. This may result in incorrect timestamps in the output file. [mpeg @ 0x1d7db2030500] Non-monotonic DTS in output stream 0:0; previous: 16071649, current: 16071649; changing to 16071650. This may result in incorrect timestamps in the output file. [...] [...] [mpeg @ 0x13522ca30500] buffer underflow st=0 bufi=45673 size=48884 [mpeg @ 0x13522ca30500] packet too large, ignoring buffer limits to mux it [mpeg @ 0x13522ca30500] buffer underflow st=0 bufi=45673 size=48884 [mpeg @ 0x13522ca30500] buffer underflow st=0 bufi=47702 size=48884 [mpeg @ 0x13522ca30500] packet too large, ignoring buffer limits to mux it [mpeg @ 0x13522ca30500] buffer underflow st=0 bufi=47702 size=48884 [mpeg @ 0x13522ca30500] buffer underflow st=0 bufi=45144 size=51127 [mpeg @ 0x13522ca30500] packet too large, ignoring buffer limits to mux it [mpeg @ 0x13522ca30500] buffer underflow st=0 bufi=45144 size=51127 [mpeg @ 0x13522ca30500] buffer underflow st=0 bufi=47173 size=51127 [mpeg @ 0x13522ca30500] packet too large, ignoring buffer limits to mux it [...] Can I ignore that messages? But I can play that converts videos. Thanks for your time. -- Regards, Budi Janto

3 3

Faster ffprobe-based detection of open GOP h264 ?
by Andrew Randrianasulu 11 Jan '24

11 Jan '24

I was looking at videohelp forum https://web.archive.org/web/20201125203546/https://forum.videohelp.com/thre… (web archive link because it hopefully will stay active for some time even if forum software will be upgraded and ruin old links in the future) It provides this ffprobe-based method of seeing if given h264 video stream is Open GOP or not : echo entry,pkt_pts_time,pict_type,coded_picture_number > "%~n1.csv" ffprobe -v 32 -stats -y -hide_banner -i %1 -select_streams v -print_format csv -of csv -show_entries "frame=pkt_pts_time,pict_type,coded_picture_number" >> "%~n1.csv" === quote ==== You can see that the last frame of the first GOP is a B frame -- so that's an open GOP. Also, the coded picture number is higher than that of the I frame after it -- indicating that the I frame had to be decoded before the B frame, another indication of an open GOP. === quote ends === I checked one of my videos: ffprobe -v 32 -stats -y -hide_banner -i ~/Sea_of_life_plus_Mikura_dolphins_test.mp4 -select_streams v -print_format csv -of csv -show_entries "frame=pkt_pts_time,pict_type,coded_picture_number" >> "Sea_of_life-n1.csv" and it seems resulting cvs file show it as open GOP consistently with mediainfo: frame,8.308300,B,250 frame,8.341667,I,249 frame,8.375033,B,253 mediainfo (v23.11) snip: === snip === Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High(a)L4.1 Format settings : 4 Ref Frames Format settings, CABAC : No Format settings, Reference frames : 4 frames Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 5 min 4 s Bit rate : 16.0 Mb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 29.970 (30000/1001) FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.257 Stream size : 575 MiB (99%) Writing library : x264 core 148 Encoding settings : cabac=0 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=0 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=3 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=0 / b_bias=0 / direct=1 / weightb=1 / open_gop=1 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=0 / intra_refresh=0 / rc_lookahead=40 / rc=abr / mbtree=1 / bitrate=16000 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / ip_ratio=1.41 / aq=1:1.00 Codec configuration box : avcC ==== snip ends === So, at least I may try to cut this video at various intervals and see if cutting breaks on specifically open-gop h264 stream. But as it was said in forum post above - ffprobe a bit slow, few minutes for whole video, eating one cpu core completely. Is there faster way to get this info ?

2 3

Blend effect with displace filter
by emmanuel martin 11 Jan '24

11 Jan '24

Hello, I’m experimenting with the ‘displace’ filter, and I’d like to apply my displacement maps with a blend effect on the main track. I’ve tried various things without success, and I haven’t found many examples of using this filter. Is it possible to achieve this? Thank you 🙏 Emmanuel

2 1

Decoding performance, 6.1.1 vs. 4.4.4
by René J. V. Bertin 10 Jan '24

10 Jan '24

Hi, I've just built and installed FFmpeg 6.1.1 in parallel to my trust 4.4.4 installation, using the exact same compiler options and clang (9 and 8, respectively; v6.1.1 does get debug info via `-g`). This is about performance on 2 older machines: a Mac with a 2nd gen i7 (Sandybridge) and a Linux notebook with an N3150 CPU, both having only the eGPU for graphics and thus limited to H264 decoding in terms of hardware acceleration. To evaluate performance I used 2 1080p videos; a VP9 one downloaded from YT (30Hz) and the "Big Buck Bunny" video from the Blender foundation (bbb_sunflower_1080p_60fps_normal.mp4; H264, 60Hz). I used `-threads 4 -i <video> -benchmark -f null -`. On the Mac, performance compares as you'd prefer to see it: v6.1.1 is consistently a tiny bit faster for CPU decoding than v4.4.4 while hw-accelerated decoding is just as fast (or slow if you want). On Linux the situation is opposite, sadly. A consistent small loss of performance for v6.1.1 in CPU decoding but the big surprise was a somewhat bigger loss in VAAPI-accelerated decoding. FFmpeg 4.4.4: ``` > time ffmpeg -threads 4 -hwaccel vaapi -i bbb_sunflower_1080p_60fps_normal.mp4 - benchmark -f null - frame=38072 fps=123 q=-0.0 Lsize=N/A time=00:10:34.56 bitrate=N/A speed=2.05x video:19928kB audio:356706kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown bench: utime=198.046s stime=44.752s rtime=309.083s bench: maxrss=168904kB 198.431 user_cpu 44.791 kernel_cpu 5:09.48 total_time 78.5%CPU {168904M 13F 2504898R 695857I 0O 462253w 226657c} ``` FFmpeg 6.1.1: ``` > time ffmpeg6 -threads 4 -hwaccel vaapi -i bbb_sunflower_1080p_60fps_normal.mp4 -benchmark -f null - frame=38072 fps= 91 q=-0.0 Lsize=N/A time=00:10:34.55 bitrate=N/A speed=1.51x bench: utime=245.679s stime=119.927s rtime=419.141s bench: maxrss=137632kB 246.007 user_cpu 119.987 kernel_cpu 6:59.49 total_time 87.2%CPU {137632M 0F 16342471R 695447I 0O 847360w 243741c} ``` (sorry for the linebreaks, I'm posting via a newsgroup app.) To me this looks like there's been a regression that causes an increased overhead in getting the content onto and/or off the GPU. Is that possible? Could it have to do with the fact that FFmpeg6 auto-enables support for hw-acceleration via Vulkan (a moot selling point on this hardware) and if so would it help to disable that support? Thanks, R.

2 1