September 2018 - ffmpeg-user - lists.ffmpeg.org

Recording audio from mic and speakers from commandline
by Mohan G 28 Sep '21

28 Sep '21

Hi, I am using ffmpeg version 2.4.7 on Fedora-21 workstation. I want to record audio, simultaneously from mic and speakers as separate streams. I am using the following command for it. ffmpeg -f alsa -i pulse -f alsa -i default -acodec libmp3lame -map 0:0 -map 1:0 outfile.mkv But after executing this command in terminal, I have to goto "Volume Control" settings in GUI, then goto "Recording" tab, change the "capture from" of one channel to "Built-in Audio Analog Stereo" (i.e., Mic) and the "capture from" of another channel to "Monitor of Built-in Audio Analog Stereo" (i.e., Speakers). But how can this be done completely from command-line, for automating it to use in scripts. - Mohan

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How to have a secure UDP BroadCast
by hassan shatnawi 19 Aug '20

19 Aug '20

Dears, How to have a secure connection with username and password while broadcasting "UPD" I've use this command ffmpeg -f dshow -video_size 1280x720 -rtbufsize 702000K -framerate 30 -i video="Video (00-0 Pro Capture Quad HDMI)" -r 30 -threads 4 -vcodec libx264 -crf 0 -preset ultrafast -f mpegts "udp://username:password@192.168.1.12:6666" but it didn't work can you advice me plz. Thanks in advance. *Hassan Shatnawi* Software Developer *Software Development Department* *Haupshy Establishment for Electronics* Al Madina Al Monawara St. bld 31 | P.O.Box 6875 Amman 11118, Jordan. *T: *+962 6 5820 927* | F: *+962 6 5820 926* | M: *+962 78 5792 096 *E*: hassan(a)haupshy.com *|* www.haupshy.com

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HDR specification transfert
by Rollie Tyler 10 Feb '19

10 Feb '19

Hello everybody, I am trying to use FFMPEG ( 3.4 version) to transfert HDR video specifications (x265.mp4 videos). I have seen on other forums command lines that I tried to test for me but I never have succesfull results. I want to use Nvidia options (NVENC/SCALE_NPP/or other) because I have a P4 graphic card. Here is my file (Media Info) General Complete name : /storage/input_HDR.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/iso2/mp41) File size : 293 MiB Duration : 54 s 422 ms Overall bit rate mode : Variable Overall bit rate : 45.1 Mb/s Writing application : Lavf56.15.103 Video ID : 1 Format : HEVC Format/Info : High Efficiency Video Coding Format profile : Main 10@L5.1@High Codec ID : hev1 Codec ID/Info : High Efficiency Video Coding Duration : 54 s 375 ms Bit rate : 44.8 Mb/s Width : 3 840 pixels Height : 2 160 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 24.000 FPS Original frame rate : 23.976 (24000/1001) FPS Color space : YUV Chroma subsampling : 4:2:0 (Type 2) Bit depth : 10 bits Bits/(Pixel*Frame) : 0.225 Stream size : 290 MiB (99%) Writing library : ATEME Titan KFE 3.7.0 (4.7.0.2002) Color range : Limited Color primaries : BT.2020 Transfer characteristics : SMPTE ST 2084 Matrix coefficients : BT.2020 non-constant Mastering display color primaries : R: x=0.680000 y=0.320000, G: x=0.265000 y=0.690000, B: x=0.150000 y=0.060000, White point: x=0.312700 y=0.329000 Mastering display luminance : min: 0.0200 cd/m2, max: 1200.0000 cd/m2 Audio ID : 2 Format : AAC Format/Info : Advanced Audio Codec Format profile : LC Codec ID : 40 Duration : 54 s 422 ms Bit rate mode : Variable Bit rate : 384 kb/s Channel(s) : 2 channels Channel(s)_Original : 6 channels Channel positions : Front: L C R, Side: L R, LFE Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 2.47 MiB (1%) Default : Yes Alternate group : 1 And here is the command that I tried: time /FFmpeg/3.4/bin/ffmpeg -hwaccel cuvid -c:v hevc_cuvid -i /storage/input_HDR.mp4 -c:v nvenc_hevc -filter_complex [0:0]scale_npp=colormatrix=bt2020:h_chr_pos=0:v_chr_pos=0,format=yuv420p10le -pix_fmt yuv420p10le -x265-params "colorprim=bt2020:transfer=smpte-st-2084:colormatrix=bt2020nc" -crf 22 -c:a copy /storage/OUT/testHDR.mp4 When I ran the command I have this error message ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-16) configuration: --prefix=/data/TOOL-FFMPEG/target --pkg-config-flags=--static --extra-cflags=-I/data/TOOL-FFMPEG/target/include --extra-ldflags=-L/data/TOOL-FFMPEG/target/lib --enable-static --enable-pic --disable-ffserver --disable-debug --disable-shared --disable-doc --enable-gpl --enable-fontconfig --enable-version3 --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libopenjpeg --enable-libvpx --enable-libx264 --enable-libx265 --enable-libvidstab --enable-runtime-cpudetect --enable-libfribidi --enable-libsoxr --enable-libvmaf --enable-vaapi --enable-libzimg --enable-openssl --enable-nvenc --enable-cuvid --enable-libnpp --enable-cuda --enable-cuda-sdk --enable-hwaccel=hevc_vaapi --enable-hwaccel=h264_vaapi --enable-hwaccel=mpeg2_vaapi --enable-hwaccel=vp9_vaapi --enable-librtmp --enable-nonfree libavutil 55. 78.100 / 55. 78.100 libavcodec 57.107.100 / 57.107.100 libavformat 57. 83.100 / 57. 83.100 libavdevice 57. 10.100 / 57. 10.100 libavfilter 6.107.100 / 6.107.100 libswscale 4. 8.100 / 4. 8.100 libswresample 2. 9.100 / 2. 9.100 libpostproc 54. 7.100 / 54. 7.100 [aac @ 0x2ce6920] This stream seems to incorrectly report its last channel as LFE[3], mapping to LFE[0] Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/input_HDR.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2mp41 encoder : Lavf56.15.103 Duration: 00:00:54.42, start: 0.000000, bitrate: 45136 kb/s Stream #0:0(und): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2160 [SAR 1:1 DAR 16:9], 44788 kb/s, 24 fps, 24 tbr, 24k tbn, 23.98 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 381 kb/s (default) Metadata: handler_name : SoundHandler *[Parsed_scale_npp_0 @ 0x2ccb940] Option 'colormatrix' not found [AVFilterGraph @ 0x2cc86c0] Error initializing filter 'scale_npp' with args 'colormatrix=bt2020:h_chr_pos=0:v_chr_pos=0' Error initializing complex filters. Option not found * Why I cannot use the colomatrix option? /PS:I have tried with "scale_cuda" and it didn't work too./ -- Sent from: http://www.ffmpeg-archive.org/

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Max rtbufsize Via dshow
by Gabriel Balaich 11 Jan '19

11 Jan '19

Up until a few days ago I had been running two capture cards, 1x4K card and 1x1080P card, I would encode both streams with a GTX 1080 no dropped frames no issues. But just recently I replaced the 1080P capture card with another 4K capture card to prep for a new camera and can't get things working gracefully. On my first test encoding 2x4K60 streams simultaneously I dropped frames starting the recording *and *ending the recording, but nothing in-between. Errors displayed: [dshow @ 000001499bb17180] real-time buffer [Video (00 Pro Capture HDMI 4K+)] [video input] too full or near too full (62% of size: 2147480000 [rtbufsize parameter])! frame dropped! [dshow @ 00000149944e7080] real-time buffer [AVerMedia HD Capture GC573 1] [video input] too full or near too full (62% of size: 2147480000 [rtbufsize parameter])! frame dropped! The obvious answer, according to the warning, would be increasing rtbufsize but I seem to have hit the cap... If I try to increase rtbufsize passed 2147.48M I get another error: [dshow @ 00000250df6c7080] Value 3000000000.000000 for parameter 'rtbufsize' out of range [0 - 2.14748e+09] [dshow @ 00000250df6c7080] Error setting option rtbufsize to value 3000M. video=AVerMedia HD Capture GC573 1:audio=SPDIF/ADAT (1+2) (RME Fireface UC): Result too large Is this a baked in limitation of FFmpeg or dshow? And if it is, why impose said limitation? Since then I've tried messing with other parts of my command and found that by re-arranging my inputs / outputs I can prevent frame drops upon starting a recording but I still can't end a recording without dropping a bunch of frames. Anyone know why re-arranging my inputs / outputs would prevent frames from dropping when starting a recording or affect anything? Is it possible to bypass the rtbufsize cap? Any other ideas? Here is my full command, Ignore the blank numbers next to -ss, will be used to sync outputs when everything is working: ffmpeg -y -hide_banner -thread_queue_size 9999 -indexmem 9999 -guess_layout_max 0 -f dshow -rtbufsize 2147.48M ` -i audio="Analog (1+2) (RME Fireface UC)" ` -thread_queue_size 9999 -indexmem 9999 -guess_layout_max 0 -f dshow -rtbufsize 2147.48M ` -i audio="ADAT (5+6) (RME Fireface UC)" ` -thread_queue_size 9999 -indexmem 9999 -r 25 -f lavfi -rtbufsize 2147.48M -i color=c=black:s=50x50 ` -thread_queue_size 9999 -indexmem 9999 -guess_layout_max 0 -f dshow -video_size 3840x2160 -rtbufsize 2147.48M ` -framerate 60 -pixel_format nv12 -i video="AVerMedia HD Capture GC573 1":audio="SPDIF/ADAT (1+2) (RME Fireface UC)" ` -thread_queue_size 9999 -indexmem 9999 -guess_layout_max 0 -f dshow -video_size 3840x2160 -rtbufsize 2147.48M ` -framerate 60 -pixel_format nv12 -i video="Video (00 Pro Capture HDMI 4K+)":audio="ADAT (3+4) (RME Fireface UC)" ` -map 2,0 -map 0 -c:v libx264 -r 25 -rc-lookahead 50 -forced-idr 1 -sc_threshold 0 -flags +cgop ` -force_key_frames "expr:gte(t,n_forced*2)" -preset ultrafast -pix_fmt nv12 -b:v 16K -minrate 16K -maxrate 16K -bufsize 16k ` -c:a aac -ar 44100 -b:a 384k -ac 2 -af "aresample=async=250" -vsync 1 -ss 00:00:00.000 ` -max_muxing_queue_size 9999 -f segment -segment_time 600 -segment_wrap 9 -reset_timestamps 1 ` -segment_format_options max_delay=0 C:\Users\djcim\Videos\Main\Discord\Discord%02d.ts ` -map 2,1 -map 1 -c:v libx264 -r 25 -rc-lookahead 50 -forced-idr 1 -sc_threshold 0 -flags +cgop ` -force_key_frames "expr:gte(t,n_forced*2)" -preset ultrafast -pix_fmt nv12 -b:v 16K -minrate 16K -maxrate 16K -bufsize 16k ` -c:a aac -ar 44100 -b:a 384k -ac 2 -af "aresample=async=250" -vsync 1 -ss 00:00:00.000 ` -max_muxing_queue_size 9999 -f segment -segment_time 600 -segment_wrap 9 -reset_timestamps 1 ` -segment_format_options max_delay=0 C:\Users\djcim\Videos\Main\Soundboard\Soundboard%02d.ts ` -map 3:0,3:1 -map 3:1 -c:v h264_nvenc -r 60 -rc-lookahead 120 -forced-idr 1 -strict_gop 1 -sc_threshold 0 -flags +cgop ` -force_key_frames "expr:gte(t,n_forced*2)" -preset: llhp -pix_fmt nv12 -b:v 250M -minrate 250M -maxrate 250M -bufsize 250M ` -c:a aac -ar 44100 -b:a 384k -ac 2 -af "pan=mono|c0=c0, aresample=async=250" -vsync 1 -ss 00:00:00.000 ` -max_muxing_queue_size 9999 -f segment -segment_time 600 -segment_wrap 9 -reset_timestamps 1 ` -segment_format_options max_delay=0 C:\Users\djcim\Videos\Main\Camera\Camera%02d.ts ` -map 4:0,4:1 -map 4:1 -c:v h264_nvenc -r 60 -rc-lookahead 120 -forced-idr 1 -strict_gop 1 -sc_threshold 0 -flags +cgop ` -force_key_frames "expr:gte(t,n_forced*2)" -preset: llhp -pix_fmt nv12 -b:v 250M -minrate 250M -maxrate 250M -bufsize 250M ` -c:a aac -ar 44100 -b:a 384k -ac 2 -af "atrim=0.086, asetpts=PTS-STARTPTS, aresample=async=250" -vsync 1 -ss 00:00:00.000 ` -max_muxing_queue_size 9999 -f segment -segment_time 600 -segment_wrap 9 -reset_timestamps 1 ` -segment_format_options max_delay=0 C:\Users\djcim\Videos\Main\Magewell\Magewell%02d.ts

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Alpha Channel QT with SubTitles
by Gandharv Bhagat 05 Nov '18

05 Nov '18

Hi, I am trying to generate an alpha channel QT, with Apple animation codec, but the I get output has a white background. here is the command ffmpeg -r 23.976 -loop 1 -i Alpha_1920x1080.png -c:v qtrle -t 00:00:30.000 -vf subtitles=“Subtitle.srt:force_style='Fontsize=18,BorderStyle=1,Outline=0,Shadow=1,MarginV=25,FontName=Arial'" Subs2.mov Gandharv p.s. The PNG was created in Photoshop

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Cannot receive audio/video from Unreal WebRTC DirectShow Source filter
by Maxim Ershtein 27 Oct '18

27 Oct '18

Hello, I am trying to record VP9/Opus -encoded live stream into .mkv file. The live stream is being encoded by Chrome browser and sent via WebRTC to Unreal Media Server. Unreal Media Server allows installing WebRTC DirectShow Source filter: http://umediaserver.net/components/index.html This filter allows connecting to Unreal Media Server and receiving the original stream. It works fine in GraphEdit - I can render and play the stream. But my goal is to record it with ffmpeg to .mkv file with no transcoding. So I am doing: *ffmpeg -f dshow -show_video_device_dialog true -i video="Unreal WebRTC Client Source":audio="Unreal WebRTC Client Source" -c:a copy -c:v copy c:\temp\output.mkv* According to documentation, it should work. Notice that I am doing *-show_video_device_dialog true* This is because you need to initialize the filter, like all Unreal source filters, with the URL where to pull the stream from. This URL is not getting persisted anywhere, so each time you instantiate this filter, you need to initialize it with the URL. So the dialog allows you to input the URL. But when I do it, ffmpeg reports *"Could not get media type"*. *What am I doing wrong?* Again, using the same dialog in GraphEdit works fine and I can render pins and play. I am also looking for some automation of that dialog - how do I pass that URL to the filter using command line? The filter readme says: "Configuration parameters can be provided via property page or via IFileSourceFilter interface exposed by the filter. When configured via IFileSourceFilter interface, initialization string needs to be provided as first parameter of IFileSourceFilter::Load() method." So, I guess, ffmpeg could check if IFileSourceFilter interface is supported and then call a Load function with command line - supplied parameter. If ffmpeg doesn't support that, any ideas on how to pass the URL to the filter programmatically? Note that this is a pretty generic situation - I might have 10 ffmpeg instances loading this filter and each one is going to use a different URL. So the URL is not something static and cannot sit in registry or some config file. So same problem with other network source filters from Unreal, but I don't need others, as ffmpeg can receive rtsp, rtmp and mpeg-ts streams by itself. But ffmpeg, of course, cannot receive browser-encoded WebRTC streams with VP9/Opus encodings. Hence I am trying to use Unreal WebRTC DirectShow Source filter.

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Multiple Streams using ffmpeg (got 2 working, need 4)
by Rad J 11 Oct '18

11 Oct '18

Hello There, I would like to stream 4 cams to YouTube using ffmpeg. I was able to get 2 to work as follows: ffmpeg -rtsp_transport tcp -i "rtsp://xxxx:xxxx@10.1.10.125:554/cam/realmonitor?channel=1&subtype=0" -i "rtsp://xxxx:xxxx@10.1.10.125:554/cam/realmonitor?channel=2&subtype=0" -f lavfi -i anullsrc -filter_complex " [0:v] setpts=PTS-STARTPTS, scale=800x448,setsar=1[upperleft]; [1:v] setpts=PTS-STARTPTS, scale=800x448,setsar=1[upperright]; [upperleft][upperright]hstack[base]" -map [base] -map 2 -f flv rtmp:// x.rtmp.youtube.com/live2/xxxx:xxxx-xxxx:xxxx But how do I add two more below those two? You can view the two here: https://www.youtube.com/channel/UCxyIPYgLqtqLl2one2J7goQ/live Thanks, Zarks

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CSV to KLV stream into mpeg-ts file
by Poulet CotCot 10 Oct '18

10 Oct '18

Hello, Do you know if ffmpeg can encode klv data from a csv file and inject it into an existing mpeg ts file? (Or any other appropiate container?) Thank you, Best Regards, Andrew

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[LDP] FFmpeg at LinuxDays 2018 in Prague
by Thilo Borgmann 09 Oct '18

09 Oct '18

Hi all, FFmpeg been accepted for a booth at the LinuxDays 2018 in Prague, Czech Republic during October 6th to 7th! We've made contact during this years CLT. This is our first attendance to this end-user conference that has a similar program like the Linux Days in Chemnitz - means mainly booths and talks as well as a lot of users and fellow open-source projects. Find detailed information here: https://www.linuxdays.cz/2018/en/ Currently, I'm the only staff member registered - any other developer is welcome to join in! Prague is quite affordable regarding travel & accomodation, so don't hesitate if you've interest in coming. Hope to meet you there! -Thilo

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Question about conversion (Transcoding)
by JD 03 Oct '18

03 Oct '18

I have an mpeg2 file which I am trying to convert to a dvd iso. I am using dvdauthor to do it. dvdauthor says the file is not mpeg2 video compatible. When I run ffprobe on the file, I get this ffprobe /usr/tmp/title_3-09h31m23s.mpg ffprobe version N-51556-ge278500 Copyright (c) 2007-2013 the FFmpeg developers built on Apr 4 2013 05:11:43 with gcc 4.6 (Debian 4.6.3-1) configuration: --prefix=/root/ffmpeg-static/32bit --arch=x86_32 --extra-cflags='-m32 -I/root/ffmpeg-static/32bit/include -static' --extra-ldflags='-m32 -L/root/ffmpeg-static/32bit/lib -static' --extra-libs='-lxml2 -lexpat -lfreetype' --enable-static --disable-shared --disable-ffserver --disable-doc --enable-bzlib --enable-zlib --enable-postproc --enable-runtime-cpudetect --enable-libx264 --enable-gpl --enable-libtheora --enable-libvorbis --enable-libmp3lame --enable-gray --enable-libass --enable-libfreetype --enable-libopenjpeg --enable-libspeex --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-version3 --enable-libvpx libavutil 52. 24.100 / 52. 24.100 libavcodec 55. 2.100 / 55. 2.100 libavformat 55. 1.100 / 55. 1.100 libavdevice 55. 0.100 / 55. 0.100 libavfilter 3. 49.100 / 3. 49.100 libswscale 2. 2.100 / 2. 2.100 libswresample 0. 17.102 / 0. 17.102 libpostproc 52. 2.100 / 52. 2.100 [mpeg @ 0xab1d7c0] max_analyze_duration 5000000 reached at 5024000 microseconds [mpeg @ 0xab1d7c0] Could not find codec parameters for stream 1 (Audio: ac3, 0 channels): unspecified sample format Consider increasing the value for the 'analyzeduration' and 'probesize' options [NULL @ 0xab1e760] start time is not set in estimate_timings_from_pts Input #0, mpeg, from '/usr/tmp/title_3-09h31m23s.mpg': Duration: 02:10:42.11, start: 45337.301611, bitrate: 5391 kb/s Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [SAR 32:27 DAR 16:9], 29.97 fps, 59.92 tbr, 90k tbn, 59.94 tbc Stream #0:1[0x20]: Audio: ac3, 0 channels Stream #0:2[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s So, how do I convert this file to a DVD compatible mpeg2 file?

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