February 2021 - ffmpeg-user - lists.ffmpeg.org

converting raw stills to "raw" video
by shawny 16 Feb '21

16 Feb '21

I am trying to find out if it is possible using ffmpeg to convert raw stills into "raw" or log video in order to be gradable as video. This is to incorporate timelapse photography into my video projects. I know this can be done using Adobe After Effects but I am trying to find a post path that uses Linux and open source software. Has anyone done this or is anyone able to tell me one way or another whether it is currently possible with ffmpeg? -- Sent from: http://ffmpeg-users.933282.n4.nabble.com/

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Artifacts with mp4-Video
by Ulf Zibis 16 Feb '21

16 Feb '21

Hi, I have created a mp4 video with: $ ffmpeg -i Kiosk\ Mozartstr.\ -\ Andreas.mpg Kiosk\ Mozartstr.\ -\ Andreas.mp4 ffmpeg version 4.3.1-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2020 the FFmpeg developers built with gcc 8 (Debian 8.3.0-6) configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg libavutil 56. 51.100 / 56. 51.100 libavcodec 58. 91.100 / 58. 91.100 libavformat 58. 45.100 / 58. 45.100 libavdevice 58. 10.100 / 58. 10.100 libavfilter 7. 85.100 / 7. 85.100 libswscale 5. 7.100 / 5. 7.100 libswresample 3. 7.100 / 3. 7.100 libpostproc 55. 7.100 / 55. 7.100 Input #0, mpeg, from 'Kiosk Mozartstr. - Andreas.mpg': Duration: 00:26:00.49, start: 0.529989, bitrate: 1793 kb/s Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bt470bg, progressive), 352x288 [SAR 12:11 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc Side data: cpb: bitrate max/min/avg: 9578800/0/0 buffer size: 1835008 vbv_delay: N/A Stream #0:1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16p, 384 kb/s Stream mapping: Stream #0:0 -> #0:0 (mpeg2video (native) -> h264 (libx264)) Stream #0:1 -> #0:1 (mp2 (native) -> aac (native)) Press [q] to stop, [?] for help [libx264 @ 0x6836ac0] using SAR=12/11 [libx264 @ 0x6836ac0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64 [libx264 @ 0x6836ac0] profile High, level 1.3, 4:2:0, 8-bit [libx264 @ 0x6836ac0] 264 - core 161 r3018 db0d417 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 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=1 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=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to 'Kiosk Mozartstr. - Andreas.mp4': Metadata: encoder : Lavf58.45.100 Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 352x288 [SAR 12:11 DAR 4:3], q=-1--1, 25 fps, 12800 tbn, 25 tbc Metadata: encoder : Lavc58.91.100 libx264 Side data: cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s Metadata: encoder : Lavc58.91.100 aac frame=39012 fps= 59 q=-1.0 Lsize= 152547kB time=00:26:00.36 bitrate= 800.9kbits/s speed=2.34x video:126928kB audio:24474kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.756065% [libx264 @ 0x6836ac0] frame I:303 Avg QP:22.95 size: 18951 [libx264 @ 0x6836ac0] frame P:10864 Avg QP:25.32 size: 7268 [libx264 @ 0x6836ac0] frame B:27845 Avg QP:28.91 size: 1626 [libx264 @ 0x6836ac0] consecutive B-frames: 1.9% 3.2% 16.8% 78.1% [libx264 @ 0x6836ac0] mb I I16..4: 2.3% 87.0% 10.7% [libx264 @ 0x6836ac0] mb P I16..4: 0.5% 8.9% 1.0% P16..4: 41.9% 28.0% 18.0% 0.0% 0.0% skip: 1.7% [libx264 @ 0x6836ac0] mb B I16..4: 0.1% 1.0% 0.1% B16..8: 48.1% 7.8% 2.1% direct: 7.6% skip:33.4% L0:36.1% L1:39.8% BI:24.1% [libx264 @ 0x6836ac0] 8x8 transform intra:86.3% inter:80.9% [libx264 @ 0x6836ac0] coded y,uvDC,uvAC intra: 87.5% 88.2% 46.9% inter: 32.6% 47.2% 4.6% [libx264 @ 0x6836ac0] i16 v,h,dc,p: 26% 32% 12% 30% [libx264 @ 0x6836ac0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 19% 26% 5% 6% 6% 6% 6% 8% [libx264 @ 0x6836ac0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 20% 13% 6% 8% 8% 9% 7% 8% [libx264 @ 0x6836ac0] i8c dc,h,v,p: 56% 19% 17% 8% [libx264 @ 0x6836ac0] Weighted P-Frames: Y:4.4% UV:1.8% [libx264 @ 0x6836ac0] ref P L0: 44.6% 15.3% 31.0% 8.8% 0.3% [libx264 @ 0x6836ac0] ref B L0: 84.6% 13.4% 2.0% [libx264 @ 0x6836ac0] ref B L1: 96.0% 4.0% [libx264 @ 0x6836ac0] kb/s:666.33 [aac @ 0x6839580] Qavg: 231.969 Playing this video with VLC video player shows artifacts, see attached screen shot. I'm wondering about this, because I never had such effect the last years. So please can you have a look to the video, if there is something special with it? : http://www.jugkoeln.de/Videos/Kiosk%20Mozartstr.%20-%20Andreas.mp4 Thanks -Ulf

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Problem with get rtsp streaming in UDP from private network
by Lidor Abo 16 Feb '21

16 Feb '21

Hey there, I have a problem with get streaming from wowza stream engine as described below: I try to get streaming in private network from wowza stream engine in UDP with ffmpeg as following: ffmpeg -loglevel debug -rtsp_transport udp -i "rtsp:// 192.168.8.117:1935/live/ecad838c-b431-4c8b-b2e8-d43f78a8d2f2.stream" -acodec copy -vcodec copy test.mp4 and i get the following error: rtsp://192.168.8.117:1935/live/ecad838c-b431-4c8b-b2e8-d43f78a8d2f2.stream: Connection timed out Few remarks about that: 1. When i try to get streaming using public ip with ffmpeg utility i success in UDP and TCP 2. I success to get streaming with private IP with TCP connection through ffmpeg utility as following: ffmpeg -loglevel debug -rtsp_transport tcp -i "rtsp:// 192.168.8.117:1935/live/ecad838c-b431-4c8b-b2e8-d43f78a8d2f2.stream" -acodec copy -vcodec copy test.mp4 3. I open 1935 UDP and TCP ports in security group of wowza stream engine for machines that will need to get streaming from wowza stream engine. Also, i opened UDP in 6970-9999 range for any ip address. 4. I added relevant IP address in Whitelist property in Server.xml conf in wowza stream engine. 5. I using vpn service (perimeter) to access the machine that from it i get streaming from wowza streaming engine. 6. iptables in machine that i try to get stream allow any rule and not enabled any firewall.

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Problem with get rtsp streaming in UDP from private network
by Lidor Abo 16 Feb '21

16 Feb '21

Hey there, I have a problem with get streaming from wowza stream engine as described below: I try to get streaming in private network from wowza stream engine in UDP with ffmpeg as following: ffmpeg -loglevel debug -rtsp_transport udp -i "rtsp:// 192.168.8.117:1935/live/ecad838c-b431-4c8b-b2e8-d43f78a8d2f2.stream" -acodec copy -vcodec copy test.mp4 and i get the following error: rtsp://192.168.8.117:1935/live/ecad838c-b431-4c8b-b2e8-d43f78a8d2f2.stream: Connection timed out Few remarks about that: 1. When i try to get streaming using public ip with ffmpeg utility i success in UDP and TCP 2. I success to get streaming with private IP with TCP connection through ffmpeg utility as following: ffmpeg -loglevel debug -rtsp_transport tcp -i "rtsp:// 192.168.8.117:1935/live/ecad838c-b431-4c8b-b2e8-d43f78a8d2f2.stream" -acodec copy -vcodec copy test.mp4 3. I open 1935 UDP and TCP ports in security group of wowza stream engine for machines that will need to get streaming from wowza stream engine. Also, i opened UDP in 6970-9999 range for any ip address. 4. I added relevant IP address in Whitelist property in Server.xml conf in wowza stream engine. 5. I using vpn service (perimeter) to access the machine that from it i get streaming from wowza streaming engine. 6. iptables in machine that i try to get stream allow any rule and not enabled any firewall.

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Trying to stream to rtmp from my rsp4 and a GoPro
by Mike Soultanian 16 Feb '21

16 Feb '21

Hey Everyone, I'm trying to stream from my GoPro into a USB capture device through my Raspberry Pi 4 and send the feed up to Twitch or my rtmp server. After a lot of head banging I realized that there were two things that were messing me up: 1) specifying an audio input seems to break things and 2) trying to use the h264_v4l2m2m hardware encoder also seems to mess things up. After finding the ffmpeg streaming wiki here: https://trac.ffmpeg.org/wiki/EncodingForStreamingSites I was finally able to cobble this command-line together and get it working... kinda: *ffmpeg -f v4l2 -video_size 1280x720 -framerate 30 -i /dev/video0 -c:v libx264 -preset veryfast -b:v 1984k -maxrate 1984k -bufsize 3968k -vf "format=yuv420p" -g 60 -c:a aac -b:a 128k -ar 44100 -f flv rtmp://sfo.contribute.live-video.net/app/[my key]* I say kinda because I can't seem to get audio working. Now, I just want to say that using the QT v4l2 test utility I'm able to get audio and video simultaneously, so I know that the capture feed from my GoPro is healthy, and using ffmpeg I'm able to record either video from */dev/video0* or audio from *plughw:2,0*, but it seems like whenever I add *-f alsa -i plughw:2,0* in addition to *-i /dev/video0*, it won't stream anything (or record anything during my recording attempts). Am I missing something obvious here? I was hoping that I'm just doing something stupid, but even looking on that wiki listed above it looks like all I need to do is add *-f alsa -ac 2 -i plughw:2,0* and it should work, but it just seems to kill the stream or record nothing. Also, I'd love to be able to use the hardware encoder, so any thoughts on that would be appreciated, but getting both audio and video is the main priority. Btw, if you're curious about what I'm doing, I'm trying to build a DIY mobile streaming rig that I can take hangliding/paragliding with me so people can watch. I thought it would be a fun project but this portion has turned out to be quite challenging!! Thanks! Mike

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Filter documentation -- PTSs
by Mark Filipak (ffmpeg) 16 Feb '21

16 Feb '21

Disclosure: Everything that follows may be wrong. I reckon that, except for a few filters, the important metric is PTS, not the frame #s assigned at a filter's input node nor its wall-clock arrival time at a filter's input node. For example, 'interleave' performs frame interleaves based on the PTSs of incoming frames -- at least, that's what I think. Am I correct? If so, wouldn't it be helpful if filter documentation included how it generates PTSs? Filter documentation should include: 1, More than just the names of directives (i.e. "options") -- some do, some don't, 2, Input specifications that include 2.1, The minimum number of output frames, 2.2, The number of output frames per input frame, and 2.3, Indication of the frames that are dropped (if any), for example: "first frame is dropped", "last 2 frames are dropped", etc., and 3, The mathematical formula employed to calculate output PTSs. I urge responses from all who are critical -- You know who you are! Perhaps someday we will be allowed to contribute. There are several of us who are critical. If allowed, we could resolve all issues for all filters in just a few days. -- Any journey, no matter how long, is just a series of small steps. "Government is the problem!" -- 1982 and onward. "_______ is the enemy of the people!" -- 2016 and onward. "You have to fight like hell or you're not going to have a country!" -- Jan 6, 2021. It isn't the distance that's important, it's the direction.

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I do not want to receive mail anymore.
by MERT Gürtürk 15 Feb '21

15 Feb '21

Hi, I do not want to receive mail anymore. Please remove me from your mail notifications Best Regards, Mert. Res. Asis. Mert Gurturk Yildiz Technical University Faculty of Civil Engineering Dept. of Geomatic Engineering e-mail: mgurturk(a)yildiz.edu.tr Tel: +902123835310 web: http://avesis.yildiz.edu.tr/mgurturk/

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Same output bit depth and sampling frequency as input?
by Marco Mircoli 15 Feb '21

15 Feb '21

Hello everybody, wondering how to set the same output audio specs (sample rate anche bit depth) as input. I tried like that ffmpeg -i FILE_FROM -af dynaudnorm,loudnorm=I=-16. 5:TP=-1.5:LRA=7 -sample_fmt s16 -ar 44100 FILE_TO if I have a 48KHZ input, the output is 44100, so doesn't work for my needs Tried without ffmpeg -i FILE_FROM -af dynaudnorm,loudnorm=I=-16. 5:TP=-1.5:LRA=7 FILE_TO The result is: same bit depth of input file but 192Khz sample rate. (file input sr is 48khz) Anybody can give me a suggest? Thanks, S.

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What's the purpose of bswap_buf() function?
by Vasily Postnicov 15 Feb '21

15 Feb '21

Hello. I try to add APE decoder support to my own library of audio codecs. Since APE is a closed format, I use ffmpeg as a reference trying to understand how it works. I cannot understand how this line works in libavcodec/apedec.c: s->bdsp.bswap_buf((uint32_t *) s->data, (const uint32_t *) buf, buf_size >> 2); I thought it swaps even and odd bytes, but it does something more than that. It's written in assembly code which I can not read clearly. Also it lacks any documentation. Can anyone explain what it does?

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Add subtitles to trimmed mp4
by adam smith 13 Feb '21

13 Feb '21

Hi people, I have a subtitle question; yay. I have a 2 minute mp4 that I am going to trim using -ss and -to . I have a SRT subtitle file with timings that will line up with the trimmed mp4. If I try and trim the mp4 and add the subtitles at the same time, the trim is ignored and the whole media file is encoded. ffmpeg -y -i /data/disposable/localised_20210212-1147-u81zpu/full_mp4.mp4 -ss 10 -to 40 -i https://somewhere/source/subtitles/subtitles.srt -filter_complex "[0:1]fifo[vout];[0:0]afifo[01_afifo]" -map "[vout]" -map "[01_afifo]" -map 1 -pix_fmt yuv420p -c:v libx264 -s 1920x1080 -profile:v high -level:v 4.1 -refs:v 2 -keyint_min 50 -b:v 15000k -r 25 -ac 2 -bsf:a aac_adtstoasc -c:a libfdk_aac -ar 48000 -b:a 192k -c:s:0 mov_text -metadata:s:s:0 language=eng -flags +global_header -f tee "[f=mp4:movflags=+faststart]/data/disposable/transcode_20210212-1147-znbqck/edit_2805.mp4" If I add the -ss and -to command to the subtitle input file too, the output file has been trimmed, but the subtitles are out of sync. The subtitles stay locked to the time of the source media. ffmpeg -y -i /data/disposable/localised_20210212-1147-u81zpu/full_mp4.mp4 -ss 10 -to 40 -i https://somewhere/source/subtitles/subtitles.srt -ss 10 -to 40 -filter_complex "[0:1]fifo[vout];[0:0]afifo[01_afifo]" -map "[vout]" -map "[01_afifo]" -map 1 -pix_fmt yuv420p -c:v libx264 -s 1920x1080 -profile:v high -level:v 4.1 -refs:v 2 -keyint_min 50 -b:v 15000k -r 25 -ac 2 -bsf:a aac_adtstoasc -c:a libfdk_aac -ar 48000 -b:a 192k -c:s:0 mov_text -metadata:s:s:0 language=eng -flags +global_header -f tee "[f=mp4:movflags=+faststart]/data/disposable/transcode_20210212-1147-znbqck/edit_2805.mp4" Is there any way to force the subtitles in the SRT to be mapped to the time of the output? I would prefer not to do it in two passes if possible. I can include console output if it helps but I am pretty sure I am just putting the command together incorrectly and nothing untoward is happening. Thanks in advance for your advice. Adam Sent from my iPhone

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