Recherche avancée

Sur d’autres sites (3833)

• FFmpeg stream map doesn't work any more

  5 mai 2016, par Tommy

  I have troubles to get for example first stream from MKV file. Strange is that my script used to work on older Debian and same code doesn’t work on Debian 8. I checked also manual and there is the same :

  ffmpeg -i INPUT -map 0:1 out.wav

  Do you know what is wrong ?

  Thank you

      tommy@reco1:/home/www/media/20$ ffmpeg -i /home/www/media/21/21.mkv -map 0:1 /var/www/vids/21/new.mkv  
  
  ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.9.2 (Debian 4.9.2-10)
  
    configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector-strong -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64-linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libpulse --disable-mips32r2 --disable-mipsdspr1 --disable-mipsdspr2 --enable-libvidstab --enable-libzvbi --enable-avresample --disable-htmlpages --disable-podpages --enable-libutvideo --enable-libfdk-aac --enable-libx265 --enable-libiec61883 --enable-vaapi --enable-libdc1394 --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Guessed Channel Layout for  Input Stream #0.2 : mono
  
  Guessed Channel Layout for  Input Stream #0.3 : mono
  
  Guessed Channel Layout for  Input Stream #0.4 : stereo
  
  Input #0, matroska,webm, from '/home/www/media/21/21.mkv':
  
    Metadata:
  
      MINOR_VERSION   : 0
  
      COMPATIBLE_BRANDS: mp42isom
  
      MAJOR_BRAND     : mp42
  
      ENCODER         : Lavf56.25.101
  
    Duration: 00:01:30.16, start: 0.000000, bitrate: 3512 kb/s
  
      Stream #0:0(und): Video: h264 (Main), yuv420p(tv), 1024x576 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 50 tbc (default)
  
      Stream #0:1: Audio: pcm_s16le, 16000 Hz, 1 channels, s16, 256 kb/s
  
      Metadata:
  
        ENCODER         : Lavc56.56.101 pcm_s16le
  
      Stream #0:2: Audio: pcm_s16le, 16000 Hz, 1 channels, s16, 256 kb/s
  
      Metadata:
  
        ENCODER         : Lavc56.56.101 pcm_s16le
  
      Stream #0:3: Audio: pcm_s16le, 16000 Hz, 1 channels, s16, 256 kb/s
  
      Metadata:
  
        ENCODER         : Lavc56.56.101 pcm_s16le
  
      Stream #0:4(und): Audio: pcm_s16le, 16000 Hz, 2 channels, s16, 512 kb/s (default)
  
      Metadata:
  
        LANGUAGE        : und
  
        ENCODER         : Lavc56.56.101 pcm_s16le
  
  /var/www/vids/21/new.mkv: No such file or directory

• Concatenate chunk containg headers to another chunk in h264

  18 novembre 2014, par Ortixx

  I’m trying to extract thumbnails from a torrent stream by downloading the first couple of chunks to get the headers, another set of chunks from the middle and then concat them to have a single video file.

  For this I’m using nodejs but I’m having trouble with the concatenation part. Obviously the headers include the length of the video so if I simply concat another chunk to the end of the headers chunk, it won’t work.

  In other words, I have 2 chunks of a video file : The first one contains the headers and some material and the other one is fully composed of a video stream. I want to combine the two to form a single video file
  So my question is how can I make this work properly if at all ?

• ffmpeg h264 interesting bright video fail ?

  23 novembre 2019, par Max Paython

  I am trying streaming with ffmpeg using the information I found here.

  • Server

    ffmpeg -f dshow -i video="john":audio="doe" -vcodec libx264
    
    -preset ultrafast -tune zerolatency -acodec aac -f mpegts udp://localhost:1234

  • Client

    ffmpeg -i udp://localhost:1234?listen test.mp4

  The client will actually live stream the video, but for testing purposes I am writing the output to a file for now.

  Here comes the interesting part. I began the stream(video and audio) in a dark room, everything is fine. I turn on the room’s lights and the client cries with many errors. I later checked the output, it is very corrupted indeed on the light turned-on parts. What could be the reason behind this ? I am posting the errors here if it could be of assistance.

  Some of the errors :

  udp://localhost:1234?listen: corrupt decoded frame in stream 0trate= 845.6kbits/s dup=1250 drop=0 speed=1.08x
  
      Last message repeated 1 times
  
  [h264 @ 0000026c4af69400] Invalid NAL unit 1, skipping.7.61 bitrate= 864.7kbits/s dup=1441 drop=0 speed=1.07x
  
  [h264 @ 0000026c4af69400] Invalid level prefix
  
  [h264 @ 0000026c4af69400] error while decoding MB 18 8
  
  [h264 @ 0000026c4af69400] concealing 911 DC, 911 AC, 911 MV errors in P frame
  
  [h264 @ 0000026c4af4b780] Invalid NAL unit 1, skipping.
  
  [h264 @ 0000026c4af4b780] negative number of zero coeffs at 10 14
  
  [h264 @ 0000026c4af4b780] error while decoding MB 10 14
  
  [h264 @ 0000026c4af4b780] concealing 679 DC, 679 AC, 679 MV errors in P frame
  
  udp://localhost:1234?listen: corrupt decoded frame in stream 0
  
      Last message repeated 1 times
  
  [h264 @ 0000026c4ba1e1c0] Invalid NAL unit 1, skipping.8.21 bitrate= 858.0kbits/s dup=1460 drop=0 speed=1.07x
  
  [h264 @ 0000026c4ba1e1c0] out of range intra chroma pred mode
  
  [h264 @ 0000026c4ba1e1c0] error while decoding MB 34 18
  
  [h264 @ 0000026c4ba1e1c0] concealing 495 DC, 495 AC, 495 MV errors in P frame
  
  [h264 @ 0000026c4bb16840] top block unavailable for requested intra mode
  
  [h264 @ 0000026c4bb16840] error while decoding MB 10 0
  
  [h264 @ 0000026c4bb16840] concealing 160 DC, 160 AC, 160 MV errors in P frame
  
  udp://localhost:1234?listen: corrupt decoded frame in stream 0
  
  [h264 @ 0000026c4bb16cc0] Invalid NAL unit 0, skipping.8.58 bitrate= 853.9kbits/s dup=1463 drop=0 speed=1.06x
  
  [h264 @ 0000026c4bb16cc0] corrupted macroblock 16 28 (total_coeff=-1)
  
  [h264 @ 0000026c4bb16cc0] error while decoding MB 16 28
  
  [h264 @ 0000026c4bb16cc0] concealing 113 DC, 113 AC, 113 MV errors in P frame
  
  [h264 @ 0000026c4bb17140] cbp too large (84) at 12 0
  
  [h264 @ 0000026c4bb17140] error while decoding MB 12 0
  
  [h264 @ 0000026c4bb17140] concealing 160 DC, 160 AC, 160 MV errors in P frame
  
  [mpegts @ 0000026c4aeb8d80] PES packet size mismatch

  Edit : As suggestion, I added these parameters to the server.

  -b:v 1M -bufsize 2M

  Now the errors are mostly gone. Except one time where it seemed like it occured just as I was turning off the lights, although I could not reproduce it after trying 4-5 times.

  Errors :

  [h264 @ 000002646f0d2f80] cbp too large (118) at 23 1422.25 bitrate= 659.5kbits/s dup=368 drop=0 speed=1.33x
  
  [h264 @ 000002646f0d2f80] error while decoding MB 23 14
  
  [mpegts @ 000002646e578d80] PES packet size mismatch
  
  [h264 @ 000002646f0d2f80] concealing 666 DC, 666 AC, 666 MV errors in P frame
  
  [h264 @ 000002646f0d0f80] concealing 160 DC, 160 AC, 160 MV errors in P frame
  
  [aac @ 000002646e64d640] Number of bands (59) exceeds limit (43).
  
  Error while decoding stream #0:1: Invalid data found when processing input
  
  [aac @ 000002646e64d640] Multiple frames in a packet.
  
  [aac @ 000002646e64d640] Reserved bit set.
  
  [aac @ 000002646e64d640] Number of bands (31) exceeds limit (29).
  
  Error while decoding stream #0:1: Invalid data found when processing input
  
  [h264 @ 000002646e5e11c0] concealing 160 DC, 160 AC, 160 MV errors in P frame
  
  udp://localhost:1234?listen: corrupt decoded frame in stream 0trate= 633.1kbits/s dup=368 drop=0 speed=1.35x
  
      Last message repeated 2 times

  The errors decreased because I increased the bitrate ? (I don’t know the default bitrate by the way). Bright decoding fails because it carries more information, data ? (same in raw video, but maybe file is heavier encoded bright frames)