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• Problems transcoding GoToMeeting output using FFmpeg

  20 avril 2014, par user3466413

  I’m having a nightmare of a time transcoding output from GoToMeeting, recorded using the latest OS X version, to something web-playable. No matter what settings I use, I end up with time syncing problems, at least with this particular recording.

  The .mov file looks like this. Note that it’s variable framerate, and because it’s mostly just a screencast of a PowerPoint presentation with occasional mouse movement, the output should be VFR too to produce a small file yet still preserve occasional motion.

  $ ffmpeg -i original.mov
  
  ffmpeg version N-58273-g18df75f Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov 19 2013 10:34:42 with Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
  
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libass --enable-libcelt --enable-libfaac --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-openssl --enable-libopus --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --prefix=/usr/local
  
    libavutil      52. 53.100 / 52. 53.100
  
    libavcodec     55. 43.101 / 55. 43.101
  
    libavformat    55. 21.100 / 55. 21.100
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 91.100 /  3. 91.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f822980a000] decoding for stream 0 failed
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'original.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2014-03-20 02:09:22
  
    Duration: 03:08:26.72, start: 0.000000, bitrate: 75 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv), 1368x728 [SAR 1:1 DAR 171:91], 20 kb/s, 0.60 fps, 600 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-03-20 02:09:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 16000 Hz, mono, fltp, 47 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-03-20 02:09:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:2(eng): Data: none (rtp  / 0x20707472), 6 kb/s
  
      Metadata:
  
        creation_time   : 2014-03-20 02:09:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:3(und): Data: none (rtp  / 0x20707472), 0 kb/s
  
      Metadata:
  
        creation_time   : 2014-03-20 02:09:22
  
        handler_name    : Apple Alias Data Handler

  The .mov file (which I unfortunately cannot publicly post) plays back properly in any application I use : VLC, Media Player Classic, and QuickTime. However, playing the transcoded output always exhibits the following symptoms :

  • Audio out of sync with what the video is showing, sometimes to the order of minutes off towards the end of this three hour recording
  • In the case of Media Player Classic, clicking a spot on the timeline actually moves the playhead to a spot on the timeline near where I clicked, but not directly on it.

  There are the arguments I’m using for a .mp4 encoding that is playable in all browsers that support H.264. Note that this is on Windows but Linux exhibits the same problems.

  ffmpeg.exe -y -i original.mov -i watermark.png -filter_complex "[0:v] crop=1184:720:178:6,scale=1184:720,setsar=1/1; [0:v][1:v] overlay=1242:648 [0:v]" -vcodec libx264 -acodec libvo_aacenc -q:a 80 -crf 30 -ac 1 -ar 16000 -strict -2 -profile:v baseline -level 3 outout.mkv

  The arguments, other than those that are self-explanatory or trivial :

  • -filter_complex : Crop excess letterboxing/pillarboxing from the video and set the aspect ratio to 1:1 for square pixels (something Safari needed), then overlay a watermark from a PNG and resize the output to 720p
  • -crf 30 : encode the video at constant quality, variable bitrate
  • -ac 1 -ar 16000 : encode with mono audio at 16 KHz
  • -strict -2 -profile:v baseline -level 3 : encode using FFmpeg’s "experimental" H.264 encoder using the Baseline level 3 profile for web compatibility

  Note that yes, this goes to an MKV container initially because, for some reason, encoding directly to a .mp4 container hangs FFmpeg. I then use -acodec copy -vcodec copy to copy the audio and video streams directly into a .mp4 container. Finally I pass the output through MP4Box to interleave it so it can be progressively downloaded.

  When transcoding, FFmpeg does drop frames, which I suspect is related to the problem, with output like this :

  FFmpeg: frame=  232 fps= 26 q=24.0 size=    5983kB time=00:32:44.57 bitrate=  24.9kbits/s dup=0 drop=1487

  When I then later attempt to mux it into the .mp4 container from this temporary .mkv container, I get a flood of warnings like this :

  [mp4 @ 0297cd00] Non-monotonous DTS in output stream 0:0; previous: 6341306, current: 6007024; changing to 6341307. This may result in incorrect timestamps in the output file.

  Now I wouldn’t be surprised if there is indeed some problem with the source file. However, if so, I need to definitively prove just how it’s broken.

  Any thoughts ?

• ffmpeg merge wav-audio and rtmp-video stream with itsoffset parameter ?

  2 juillet 2015, par whatis01

  I tried to merge WAV audio and RTMP video stream with -itsoffset parameter :

  ffmpeg -i rtmp://server/video/stream_folder/stream_id -itsoffset 00:00:15.0000 -i /audio/1227121.wav \
  
  -codec:v copy -ac 2 -codec:a aac -strict experimental -f flv rtmp://server/sfolder/test_1

  But it works inappropriately (RTMP output is not steady, only voice or only video), and always prompts : mux overhead ratio 2000%, then conversion failed.

• Error when trying to play h264 stream with ffplay

  29 août 2015, par Yehuda

  I have a file that contain part of raw h264 stream and I want to play it in Android app..

  First I tried to play it on the computer... So I tried to use ffplay for this..
  I used this command :
  ffplay.exe stream.out
  Then its opened a window and start to play it, but all i saw is a lot of green on the screen...

  The output had a lot of red lines of errors :

  [h264 @ 00000000031238c0] Reducing left cropping to 0 chroma samples to preserve alignment.
  
  [h264 @ 00000000031238c0] illegal aspect ratio
  
  [h264 @ 0000000003110ec0] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  Input #0, h264, from 'out4':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: h264 (High), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 1200k tbn, 59.94 tbc
  
  [h264 @ 0000000005791960] error while decoding MB 50 37, bytestream -11
  
  [h264 @ 0000000005791960] top block unavailable for requested intra4x4 mode -1 at 4 42
  
  [h264 @ 0000000005791960] error while decoding MB 4 42, bytestream 4057
  
  [h264 @ 0000000005791960] concealing 3519 DC, 3519 AC, 3519 MV errors in P frame
  
  [h264 @ 0000000005782840] error while decoding MB 0 3, bytestream -23
  
  [h264 @ 0000000005782fc0] error while decoding MB 1 36, bytestream -16
  
  [h264 @ 0000000005782fc0] concealing 3462 DC, 3462 AC, 3462 MV errors in P frame
  
  [h264 @ 0000000005782840] top block unavailable for requested intra4x4 mode -1 at 0 12
  
  [h264 @ 0000000005490380] top block unavailable for requested intra4x4 mode -1 at 0 12
  
  [h264 @ 0000000005490380] error while decoding MB 0 12, bytestream 917
  
  [h264 @ 0000000005782840] error while decoding MB 0 12, bytestream 4415
  
  [h264 @ 0000000005782840] top block unavailable for requested intra mode at 22 18
  
  [h264 @ 0000000005782840] error while decoding MB 22 18, bytestream 1477
  
  [h264 @ 0000000005782840] top block unavailable for requested intra4x4 mode -1 at 8 30
  
  [h264 @ 0000000005782840] error while decoding MB 8 30, bytestream 4272
  
  [h264 @ 0000000005782840] error while decoding MB 67 37, bytestream -10
  
  [h264 @ 0000000005782840] top block unavailable for requested intra mode at 51 42
  
  [h264 @ 0000000005782840] error while decoding MB 51 42, bytestream 3845
  
  [h264 @ 0000000005782840] concealing 3309 DC, 3309 AC, 3309 MV errors in P frame
  
  [h264 @ 0000000005490380] concealing 3296 DC, 3296 AC, 3296 MV errors in P frame
  
  [h264 @ 00000000057914c0] top block unavailable for requested intra4x4 mode -1 at 0 12
  
  [h264 @ 00000000057914c0] error while decoding MB 0 12, bytestream 4371
  
  [h264 @ 00000000057914c0] top block unavailable for requested intra4x4 mode -1 at 5 18
  
  [h264 @ 00000000057914c0] error while decoding MB 5 18, bytestream 5007
  
  [h264 @ 00000000057914c0] error while decoding MB 46 26, bytestream -6
  
  [h264 @ 00000000057914c0] top block unavailable for requested intra mode at 37 36
  
  [h264 @ 00000000057914c0] error while decoding MB 37 36, bytestream 1271
  
  [h264 @ 00000000057914c0] concealing 2953 DC, 2953 AC, 2953 MV errors in P frame
  
  [h264 @ 0000000005791960] concealing 3391 DC, 3391 AC, 3391 MV errors in P frame
  
  [h264 @ 0000000005782840] top block unavailable for requested intra4x4 mode -1 at 5 0
  
  [h264 @ 0000000005782840] error while decoding MB 5 0, bytestream 1025
  
  [h264 @ 0000000005782fc0] top block unavailable for requested intra4x4 mode -1 at 47 30
  
  [h264 @ 0000000005782fc0] error while decoding MB 47 30, bytestream 584
  
  [h264 @ 0000000005782840] top block unavailable for requested intra4x4 mode -1 at 8 6
  
  [h264 @ 0000000005782840] error while decoding MB 8 6, bytestream 4699
  
  [h264 @ 0000000005782fc0] concealing 3600 DC, 3600 AC, 3600 MV errors in P frame
  
  [h264 @ 0000000005782840] top block unavailable for requested intra4x4 mode -1 at 0 12
  
  [h264 @ 0000000005782840] error while decoding MB 0 12, bytestream 4586
  
  [h264 @ 0000000005782840] error while decoding MB 58 19, bytestream -6
  
  [h264 @ 0000000005782840] top block unavailable for requested intra mode at 44 30
  
  [h264 @ 0000000005782840] error while decoding MB 44 30, bytestream 3906
  
  [h264 @ 0000000005490380] top block unavailable for requested intra4x4 mode -1 at 37 0
  
  [h264 @ 0000000005490380] error while decoding MB 37 0, bytestream 805
  
  [h264 @ 0000000005490380] top block unavailable for requested intra4x4 mode -1 at 18 6
  
  [h264 @ 0000000005490380] error while decoding MB 18 6, bytestream 4681
  
  [h264 @ 0000000005782840] concealing 3271 DC, 3271 AC, 3271 MV errors in P frame
  
  [h264 @ 0000000005490380] top block unavailable for requested intra4x4 mode -1 at 53 18
  
  [h264 @ 0000000005490380] error while decoding MB 53 18, bytestream 4391
  
  [h264 @ 0000000005490380] top block unavailable for requested intra4x4 mode -1 at 2 24
  
  [h264 @ 0000000005490380] error while decoding MB 2 24, bytestream 1268
  
  [h264 @ 0000000005490380] top block unavailable for requested intra4x4 mode -1 at 0 30
  
  [h264 @ 0000000005490380] error while decoding MB 0 30, bytestream 4550
  
  [h264 @ 0000000005490380] top block unavailable for requested intra4x4 mode -1 at 0 36
  
  [h264 @ 0000000005490380] error while decoding MB 0 36, bytestream 4722
  
  [h264 @ 0000000005490380] top block unavailable for requested intra4x4 mode -1 at 0 42
  
  [h264 @ 0000000005490380] error while decoding MB 0 42, bytestream 792
  
  [h264 @ 0000000005490380] concealing 3596 DC, 3596 AC, 3596 MV errors in P frame
  
  [h264 @ 00000000057914c0] concealing 3598 DC, 3598 AC, 3598 MV errors in P frame
  
  [h264 @ 0000000005791960] top block unavailable for requested intra mode at 25 0
  
  [h264 @ 0000000005791960] error while decoding MB 25 0, bytestream 964
  
  [h264 @ 0000000005791960] top block unavailable for requested intra4x4 mode -1 at 0 12
  
  [h264 @ 0000000005791960] error while decoding MB 0 12, bytestream 4593
  
  [h264 @ 0000000005791960] top block unavailable for requested intra4x4 mode -1 at 29 24
  
  [h264 @ 0000000005791960] error while decoding MB 29 24, bytestream 954
  
  [h264 @ 0000000005791960] top block unavailable for requested intra mode at 3 30
  
  [h264 @ 0000000005791960] error while decoding MB 3 30, bytestream 799
  
  [h264 @ 0000000005791960] concealing 3118 DC, 3118 AC, 3118 MV errors in P frame
  
  [h264 @ 0000000005782fc0] top block unavailable for requested intra4x4 mode -1 at 0 30
  
  [h264 @ 0000000005782fc0] error while decoding MB 0 30, bytestream 778
  
  [h264 @ 0000000005782840] error while decoding MB 31 4, bytestream -8
  
  [h264 @ 0000000005782fc0] concealing 3600 DC, 3600 AC, 3600 MV errors in P frame
  
  [h264 @ 0000000005782840] top block unavailable for requested intra4x4 mode -1 at 4 6
  
  [h264 @ 0000000005782840] error while decoding MB 4 6, bytestream 4729
  
  [h264 @ 0000000005782840] top block unavailable for requested intra4x4 mode -1 at 0 12
  
  [h264 @ 0000000005782840] error while decoding MB 0 12, bytestream 4431
  
  [h264 @ 0000000005782840] top block unavailable for requested intra4x4 mode -1 at 38 18
  
  [h264 @ 0000000005782840] error while decoding MB 38 18, bytestream 4798
  
  [h264 @ 0000000005782840] top block unavailable for requested intra mode at 31 24
  
  [h264 @ 0000000005782840] error while decoding MB 31 24, bytestream 752
  
  [h264 @ 0000000005782840] top block unavailable for requested intra mode at 5 30
  
  [h264 @ 0000000005782840] error while decoding MB 5 30, bytestream 3844
  
  [h264 @ 0000000005782840] top block unavailable for requested intra4x4 mode -1 at 38 42
  
  [h264 @ 0000000005782840] error while decoding MB 38 42, bytestream 3739
  
  [h264 @ 0000000005782840] concealing 3291 DC, 3291 AC, 3291 MV errors in P frame
  
  [h264 @ 0000000005490380] Delayed frames seen. Reenabling low delay requires a codec flush.
  
  [h264 @ 0000000005490380] Reinit context to 1280x720, pix_fmt: yuvj420p
  
  [h264 @ 00000000057914c0] error while decoding MB 10 17, bytestream -6
  
  [h264 @ 0000000005490380] left block unavailable for requested intra4x4 mode -1 at 0 16
  
  [h264 @ 0000000005490380] error while decoding MB 0 16, bytestream 3934
  
  [h264 @ 00000000057914c0] concealing 3239 DC, 3239 AC, 3239 MV errors in P frame
  
  [h264 @ 0000000005490380] left block unavailable for requested intra mode at 0 18
  
  [h264 @ 0000000005490380] error while decoding MB 0 18, bytestream 3068
  
  [h264 @ 0000000005490380] left block unavailable for requested intra4x4 mode -1 at 0 33
  
  [h264 @ 0000000005490380] error while decoding MB 0 33, bytestream 745
  
  [h264 @ 0000000005490380] left block unavailable for requested intra4x4 mode -1 at 0 38
  
  [h264 @ 0000000005490380] error while decoding MB 0 38, bytestream 4460
  
  [h264 @ 0000000005490380] concealing 2769 DC, 2769 AC, 2769 MV errors in I frame
  
  [h264 @ 0000000005782840] error while decoding MB 79 24, bytestream -7
  
  [h264 @ 0000000005782840] concealing 3570 DC, 3570 AC, 3570 MV errors in P frame

  There is a problem with my source ?
  What can I do ?

  Thank you :)