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• How can I mux a MKV and MKA file and get it to play in a browser ?

  28 juin 2017, par Robert

  I’m using ffmpeg to merge .mkv and .mka files into .mp4 files. My current command looks like this :

  ffmpeg -i video.mkv -i audio.mka output_path.mp4

  The audio and video files are pre-signed urls from Amazon S3. Even on a server with sufficient resources, this process is going very slowly. I’ve researched situations where you can tell ffmpeg to skip re-encoding each frame, but I think that in my situation it actually does need to re-encode each frame.

  I’ve downloaded 2 sample files to my macbook pro and have installed ffmpeg locally via homebrew. When I run the command

  ffmpeg -i video.mkv -i audio.mka -c copy output.mp4

  I get the following output :

  ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 8.1.0 (clang-802.0.42)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.3.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libavresample   3.  5.  0 /  3.  5.  0
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  Input #0, matroska,webm, from '319_audio_1498590673766.mka':
  
    Metadata:
  
      encoder         : GStreamer matroskamux version 1.8.1.1
  
      creation_time   : 2017-06-27T19:10:58.000000Z
  
    Duration: 00:00:03.53, start: 2.831000, bitrate: 50 kb/s
  
      Stream #0:0(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
  
      Metadata:
  
        title           : Audio
  
  Input #1, matroska,webm, from '319_video_1498590673766.mkv':
  
    Metadata:
  
      encoder         : GStreamer matroskamux version 1.8.1.1
  
      creation_time   : 2017-06-27T19:10:58.000000Z
  
    Duration: 00:00:03.97, start: 2.851000, bitrate: 224 kb/s
  
      Stream #1:0(eng): Video: vp8, yuv420p(progressive), 640x480, SAR 1:1 DAR 4:3, 30 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        title           : Video
  
  [mp4 @ 0x7fa4f0806800] Could not find tag for codec vp8 in stream #0, codec not currently supported in container
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (copy)
  
    Stream #0:0 -> #0:1 (copy)
  
      Last message repeated 1 times

  So it appears that the specific encodings I’m working with are vp8 videos and opus audio files, which I believe are incompatible with the .mp4 output container. I would appreciate answers that cover ways of optimally merging vp8 and opus into .mp4 output or answers that point me in the direction of output media formats that are both compatible with vp8 & opus and are playable on web and mobile devices so that I can bypass the re-encoding step altogether.

  EDIT :

  Just wanted to provide a benchmark after following LordNeckbeard’s advice :

  4 min 41 second video transcoded locally on my mac
  
  
  
  LordNeckbeard’s approach : 15 mins 55 seconds (955 seconds)
  
  Current approach : 18 mins 49 seconds (1129 seconds)
  
  
  
  18% speed increase

• I detected an error downloading a twitch tv stream. I use ffmpeg. That error stops the download, how can I fix it ? [closed]

  9 juin, par sort35ofn

  I wanted to perform a download via ffmpeg of a video streamed live on the Twitch tv platform. I have windows 10 and I use cmd to run ffmpeg.

  


  The command I use to download the concert is :

  


  ffmpeg.exe -i "m3u8-link" -c copy name.ts


  


  I once downloaded with yt-dlp, but noticed that the quality was noticeably lower, at least using the following command :
yt-dlp.exe -f (bestvideo+bestaudio/best) "amazon-channel-link"

  


  That's why I prefer to download with ffmpeg. Normally I haven't had any problems with downloads. But this is already the third time (not continuously/consecutively) that I get this error. That error causes the download of the stream to terminate. It is not like in other occasions that sometimes a .ts fragment (of 3 seconds, for example) has already expired (and is not included in the download) but the download continues.

  


  [https @ 000001edada180c0] Opening 'https://sae12.playlist.ttvnw.net/v1/playlist/Cr4GlKuutNM7CxfM9Sq0mdUFxA8uA3F2oluPaJOmOPaBjmTkdiv4RxnkTtt_tEV8t2CyuH6D1E0HB3Erpbjq3mCfV5KqO4GfOMNOElmyYe2AKZcyQJHNeavrFfVBPB_pbDS5PYWTzUHoS0iTLfmn2cx-wHMHXa5MO-IdGPRixWDvezKNhOebWYscoIWvYwstshPSFvem1EN1UES7QfIDHSlBcZF3lGeVpg2yl05dhVwAX8YI9rnBtXYbwAUwcjEmPiqk_wm6oEX-2LRsw_05dznnVv6BbyYsLvyZu810xt9BNQU6rNCSzuoZhVx8gFxoyEdUt-VV3L_xj78-5CFibrvnO4uCafCZ5-wE_bEtUQeuHsLmm9Qf9Pj5BIGB2BHWm2LqlGTHcDG-8Z0u1-3_FB_h7fN7-uuyN-6-lreZYHDPviM8hKHFMU3zwNY29elgKRPgVMJ-4ysLWGuOPdwrylJpLFJSzsXhZaEE4p_4Zg6gfDuozYYttmPI2G1LErd5p1lT9DkQncFZibymap5Fiv-x21-jeNbrZo92PfW7lIo6NPdlnPWyoUTOb2KjgU9R0fm1UJt1kQJmQMVyDN2OHZ4t7dcAfyGMTwU26O7DdaYZhhv8mPMteBZcyjnLKH7e5AMtHUEVO2r9QIOiH0wDLNh-f9WS2kmRdJENBvl5mMGdyVHhBc9K9G5SuxBesi6F_9P_8agwpPo51m8ikJvSVJKduoIfVLSuto2SIe4DFI7hMxbplWfxBb1PNEoMWyeQd0iHUwDqQwVCFHq8OhGBp1EJtx1CNVtBhztLIqNXBbxR1Cdy8tx5rdJjq4EKlFKU3eh3_aRkhe7gulUKx2cZYNg4bGHpNBU1DP-std8xG1ckPdTpig-h_1okYPd7sXnynBFnhMHkVipsIJC4fkoT2MXHo3ItgMgTUBh1-oWD6qaD00VDM9TyDcCawJt-kI8-KnwlUkh7pq2cUv9ODqSjm5xcLoxPUxutCoZ9aKq9cnV0kqKPXxmLOekmgWK8G8MjFZ6Es5n46NeKREgQEBUTf2TZkUTOHZAiElyPy0ZdyOxFkdFZ06yqq8zUWG_dnhpgbrS1SueCOx5rGInRIdg94TIaDLMJTUvkLrqDdcS2jiABKgl1cy1lYXN0LTIwuAw.m3u8' for reading
[https @ 000001edad715600] HTTP error 500 Internal Server Errortrate=4480.2kbits/s speed=1.01x elapsed=0:17:30.76
[hls @ 000001edab89e500] keepalive request failed for 'https://sae12.playlist.ttvnw.net/v1/playlist/Cr4GlKuutNM7CxfM9Sq0mdUFxA8uA3F2oluPaJOmOPaBjmTkdiv4RxnkTtt_tEV8t2CyuH6D1E0HB3Erpbjq3mCfV5KqO4GfOMNOElmyYe2AKZcyQJHNeavrFfVBPB_pbDS5PYWTzUHoS0iTLfmn2cx-wHMHXa5MO-IdGPRixWDvezKNhOebWYscoIWvYwstshPSFvem1EN1UES7QfIDHSlBcZF3lGeVpg2yl05dhVwAX8YI9rnBtXYbwAUwcjEmPiqk_wm6oEX-2LRsw_05dznnVv6BbyYsLvyZu810xt9BNQU6rNCSzuoZhVx8gFxoyEdUt-VV3L_xj78-5CFibrvnO4uCafCZ5-wE_bEtUQeuHsLmm9Qf9Pj5BIGB2BHWm2LqlGTHcDG-8Z0u1-3_FB_h7fN7-uuyN-6-lreZYHDPviM8hKHFMU3zwNY29elgKRPgVMJ-4ysLWGuOPdwrylJpLFJSzsXhZaEE4p_4Zg6gfDuozYYttmPI2G1LErd5p1lT9DkQncFZibymap5Fiv-x21-jeNbrZo92PfW7lIo6NPdlnPWyoUTOb2KjgU9R0fm1UJt1kQJmQMVyDN2OHZ4t7dcAfyGMTwU26O7DdaYZhhv8mPMteBZcyjnLKH7e5AMtHUEVO2r9QIOiH0wDLNh-f9WS2kmRdJENBvl5mMGdyVHhBc9K9G5SuxBesi6F_9P_8agwpPo51m8ikJvSVJKduoIfVLSuto2SIe4DFI7hMxbplWfxBb1PNEoMWyeQd0iHUwDqQwVCFHq8OhGBp1EJtx1CNVtBhztLIqNXBbxR1Cdy8tx5rdJjq4EKlFKU3eh3_aRkhe7gulUKx2cZYNg4bGHpNBU1DP-std8xG1ckPdTpig-h_1okYPd7sXnynBFnhMHkVipsIJC4fkoT2MXHo3ItgMgTUBh1-oWD6qaD00VDM9TyDcCawJt-kI8-KnwlUkh7pq2cUv9ODqSjm5xcLoxPUxutCoZ9aKq9cnV0kqKPXxmLOekmgWK8G8MjFZ6Es5n46NeKREgQEBUTf2TZkUTOHZAiElyPy0ZdyOxFkdFZ06yqq8zUWG_dnhpgbrS1SueCOx5rGInRIdg94TIaDLMJTUvkLrqDdcS2jiABKgl1cy1lYXN0LTIwuAw.m3u8' with error: 'Server returned 5XX Server Error reply' when parsing playlist
[https @ 000001edad714900] HTTP error 500 Internal Server Errortrate=4480.2kbits/s speed=   1x elapsed=0:17:32.82
[hls @ 000001edab89e500] Failed to reload playlist 0
[https @ 000001edab8a4dc0] Opening 'https://c513a515af41.chantenay.akamai.hls.ttvnw.net/v1/segment/CvUCxQ8TAK7dXfVU_OB77Tl0jy4jVuXiNgXG_97z6zGC4vXLrJNkgegJgVTcnrjyxZuL37UAeKJ9nhR48Yq2YRy_r8EnJ3PyAX407Gj21HDw3AG1KFXL-Z1ysn7DFTvOb434uA_farXGB276wYH-n0dFr7TzD7G2sCLcYSZeyadGEwJbq3wvb7AglP8UEU0JxwZRVKWx0zX9Vd4I3EiSdAUP7w96T75UBwreFKwxvq16-od59YpbneYRYUYkgKEZSLTgrmCkm_nN4FWxOCSOhFHqHmjCenSREMJMdSHbhcqgvU5pdIxSm0ITMAxY4jX6cUTFKsqYGeKwCMHjy0gptCuPGVvEJCffxq00YNmF194USBRWumBZCp0TuRtI4LzjyPB1LARLdzJ56bCibI6lRE4hDn53zAV5ZUcWlkUIuUJ52D4vH3fRl85AQHV8UiWl8MEfyjJ4B8XxThp7lZ8nhAX42pUJ_8YgaK6BO51syG2Rkm9icm8ddRoM8pDl2Pkp8FgFncdIIAEqCXVzLWVhc3QtMjC4DA.ts?dna=CnWfUp8FT0O95nMtHpmzX-0LudnQmJLc-YARNX594okBXpxNtNQOAoOFUhTgI3_AReiOPiW_1e2e3oeoXJfoJbH4KZniEQhFhSWU7wMaSzM8CkZomzvn1Gig5l71lY9wSw8DV-QRh6LK7zfRqp5yy547EAFTbcwaDDnujf_TZXo1TVET8CABKgl1cy1lYXN0LTIwuAw' for reading
[https @ 000001edad4be180] Opening 'https://c513a515af41.chantenay.akamai.hls.ttvnw.net/v1/segment/CvUCvDoClU0qVRu8zB4Vm0gdhBMUSkOd9X-6zOlmLSLjAZDs-Oxj_mW5vBJWinuwpM4xU4bDToC8hfj7Xv80h6Rc93voJNaNiUxYWszEFu1AJh-_LsqxEJA-3nW8MBNo9YeaecC_EX8TF0VTaVBGiLI1SQNREb-1B5pAkYXfVcO_OSI2QqrssKXbBzkNwsx6dW38ir7CNT9qTZACJGzDZkxXYrSlArubviw_wXxSKXQKn0YcF3yXeKO4iXHRjkyrX0rnaSM3PRDJhr1xGT47u9J5jymTL55O9QRLS-9Z8ZN1LhqpXLxBFJbFi-4v_yJZWponNmS3F6b3rMhW3WCv5qw96B4UHF7NjFJWk0LmyLTkNcBAPC2yyARDZ02MoIXPzMSEq9Z1O4jrASPj34HXA_8BdxqZdVtyzjEekR2ThJkueLyFshQ3HIGkeFH49xpQmDNgE93VovfMACG9RTUCIPP9cZuOhTkoFBpT7JSrOx_p2oS3q4QiYxoMQNuunEN7QhQW4OPMIAEqCXVzLWVhc3QtMjC4DA.ts?dna=CnWfUp8FT0O95nMtHpmzX-0LudnQmJLc-YARNX594okBXpxNtNQOAoOFUhTgI3_AReiOPiW_1e2e3oeoXJfoJbH4KZniEQhFhSWU7wMaSzM8CkZomzvn1Gig5l71lY9wSw8DV-QRh6LK7zfRqp5yy547EAFTbcwaDDnujf_TZXo1TVET8CABKgl1cy1lYXN0LTIwuAw' for reading
[in#0/hls @ 000001edab89e3c0] Error during demuxing: Server returned 5XX Server Error reply 1x elapsed=0:17:33.34
[out#0/mpegts @ 000001edab92e880] video:547017KiB audio:12398KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 3.451806%
frame=26450 fps= 25 q=-1.0 Lsize=  578726KiB time=00:17:37.96 bitrate=4481.2kbits/s speed=   1x elapsed=0:17:33.35

yt-dlp>


  


  Is there any way to prevent this error ? Or can I do something so that the download does not stop because of this error ?

  


  And excuse me but I forgot to take a screenshot of the cmd screen, so I don't remember the colors of the letters (it certainly changed the colors of the letters when the error appeared). So I proceed to indicate that the error starts when it says : “ [hls @ 000001edab89e500] keepalive request failed for ”.

  


• FFmpeg : canvas and crop work separately but result in black screen when combined

  25 janvier, par didi00

  I'm working on a video processing pipeline with FFmpeg, where I :

  


  

  • Create a black canvas using the color filter.

  


  • Crop a region from my video input.

  


  • Overlay the cropped region onto the black canvas.

  


  


  Both the canvas and the crop display correctly when tested individually. However, when I attempt to combine them (overlay the crop onto the canvas), the result is a black screen.
What Works :

  


  Black Canvas Alone :

  


  ffmpeg -filter_complex "color=c=black:s=1920x1080[out]" -map "[out]" -f nut - | ffplay 
-


  


  This shows a plain black screen, as expected.

  


  Cropped Region Alone :

  


  ffmpeg -f v4l2 -input_format yuyv422 -framerate 60 -video_size 1920x1080 -i /dev/video0 
\ -vf "crop=1024:192:0:0" -f nut - | ffplay -


  


  This shows the cropped region of the video correctly.

  


  When I combine these steps to overlay the crop onto the black canvas, I get a black screen :

  


  ffmpeg -f v4l2 -input_format yuyv422 -framerate 60 -video_size 1920x1080 -i /dev/video0 
\-filter_complex "color=c=black:s=1920x1080,format=yuv420p[background]; \
[0:v]crop=1024:192:0:0,format=yuv420p[region0]; \
[background][region0]overlay=x=0:y=0[out]" \
-map "[out]" -f nut - | ffplay -


  


  Environment :

  


  

  • OS : Linux (Debian-based)

  


  • FFmpeg Version : [Insert version, e.g., 4.x or 5.x]

  


  • Capture Card Format : yuyv422

  


  


  Question :

  


  Why does the pipeline result in a black screen when combining the canvas and the crop, even though both work separately ? Is this an issue with pixel format compatibility, or is there something I'm overlooking in the overlay filter setup ?