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  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
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Sur d’autres sites (3324)

  • "Non-monotonous DTS" and jerky video when copying streams

    2 décembre 2017, par forthrin

    I’m switching containers from MKV to mp4 for a set of video files. This has worked for all videos before, but now I’m getting weird problems (also when converting from MKV to another MKV !)

    1. I’m getting a million Non-monotonous DTS in output stream messages
    2. With QuickTime on macOS the video is jerking back and forth very fast while playing
    3. With VLC on macOS, the video is skipping a lot of frames

    How can I fix this, without re-encoding the video stream ? (Re-encoding audio would be acceptable.) Somehow it must be possible since the original MKV works perfectly !

    $ ffmpeg -i in.mkv -codec copy out.mp4
    
ffmpeg version 3.3.4 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with Apple LLVM version 9.0.0 (clang-900.0.37)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.3.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-libass --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --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 'in.mkv':
    
  Metadata:
    
    ENCODER         : Lavf54.63.104
    
  Duration: 00:37:59.98, start: 0.200000, bitrate: 2536 kb/s
    
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc
    
    Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default)
    
[mp4 @ 0x7f93c9006c00] track 1: codec frame size is not set
    
Output #0, mp4, to 'out.mp4':
    
  Metadata:
    
    encoder         : Lavf57.71.100
    
    Stream #0:0: Video: h264 (High) ([33][0][0][0] / 0x0021), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 23.98 tbr, 16k tbn, 1k tbc
    
    Stream #0:1(eng): Audio: ac3 ([165][0][0][0] / 0x00A5), 48000 Hz, 5.1(side), fltp, 384 kb/s (default)
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)
    
Press [q] to stop, [?] for help
    
[mp4 @ 0x7f93c9006c00] Non-monotonous DTS in output stream 0:0; previous: 60720, current: 60064; changing to 60721. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7f93c9006c00] Non-monotonous DTS in output stream 0:0; previous: 63392, current: 62736; changing to 63393. This may result in incorrect timestamps in the output file.
    
(...repeats a million times...)

    MP4Box :

    $ MP4Box -add in.mkv out.mp4
    
[MPEG-2 TS] TS Packet 1 is scrambled - not supported
    
[MPEG-2 TS] TS Packet 3 does not start with sync marker
    
...
    
[MPEG-2 TS] TS Packet 999 does not start with sync marker
    
[Importer] Unknown input file type
    
Error importing in.mkv: Corrupted Data in file/stream

    So the file is maybe corrupt ? (Though it plays perfectly to begin with, in VLC at least !) Is there any way I can repair it and convert it to an mp4 file, again without re-encoding the video stream ?

  • How to properly wrap H264 into FLV with FFMPEG ?

    9 août 2017, par mOfl

    First of all, the "properly" in the title refers to this related question, of which answer does not solve my problem.

    tl ;dr : There is a difference between encoding a video and directly storing it into FLV and doing this in two separate steps. I need to do it separately, how do I get the same result as doing it directly ?

    Nvidia’s hardware encoder NVENC produces raw H.264 data without a container, which is difficult to play in most video players. For an Adobe AIR application, I need to wrap the video into the FLV format, for which I wanted to use FFMPEG :

    ffmpeg -f h264 -i "input.h264" -c copy -f flv "output.flv"

    This did not work as expected, because the first frame of each video treated this way is simply not shown. Each video is only displayed from the second frame, which is a shame for single-frame videos (using the GPU’s hardware encoder for lightning-fast image compression only).

    For inspection, I now reencode the input video twice : once directly to FLV output

    ffmpeg -f h264 -i "input.h264" -c:v h264_nvenc -f flv "A.flv"

    and once to H.264, then shoving it into an FLV afterwards.

    ffmpeg -f h264 -i "input.h264" -c:v h264_nvenc -f h264 "reencode.h264"
    
ffmpeg -f h264 -i "reencode.h264" -c copy -f flv "B.flv"

    The first video plays fine, the second does not. The resulting FLV of the direct approach (A.flv, see below) has a slightly different file structure, especially the NAL unit differs, which I suspect is the reason for the different behavior.

    So, my question is : If I already have a H.264 video and only want it to be copied into an FLV container without being transcoded, but the file and frame headers should be filled in correctly as is done when actually transcoding, how do I tell this to FFMPEG ? Are there commands for this, such as "-c copy butGenerateValidHeader" ?

    Here the relevant portions of the files :

    Direct approach

    ffmpeg -f h264 -i "input.h264" -c:v h264_nvenc -f flv "A.flv"

    A.flv

    46 4C 56 01 01 00 00 00 09 00 00 00 00 12 00 00 // FLV header + metadata
    
B8 00 00 00 00 00 00 00 02 00 0A 6F 6E 4D 65 74
    
61 44 61 74 61 08 00 00 00 08 00 08 64 75 72 61
    
74 69 6F 6E 00 3F A0 E5 60 41 89 37 4C 00 05 77
    
69 64 74 68 00 40 93 80 00 00 00 00 00 00 06 68
    
65 69 67 68 74 00 40 8E F0 00 00 00 00 00 00 0D
    
76 69 64 65 6F 64 61 74 61 72 61 74 65 00 40 9E
    
84 80 00 00 00 00 00 09 66 72 61 6D 65 72 61 74
    
65 00 40 3E 00 00 00 00 00 00 00 0C 76 69 64 65
    
6F 63 6F 64 65 63 69 64 00 40 1C 00 00 00 00 00
    
00 00 07 65 6E 63 6F 64 65 72 02 00 0D 4C 61 76
    
66 35 37 2E 37 31 2E 31 30 30 00 08 66 69 6C 65
    
73 69 7A 65 00 40 F9 5C B0 00 00 00 00 00 00 09
    

    
00 00 00 C3 09 00 00 2B 00 00 00 00 00 00 00 17 // AVC sequence start
    
00 00 00 00
    
            01 4D 40 20 FF E1 00 17             // ?
    
                                    67 4D 40 20 // Sequence parameter set
    
95 A0 13 81 F7 EB 01 10 00 00 3E 80 00 0E A6 08
    
F1 C3 2A
    
         01 00 04                               // ?
    
                  68 EE 3C 80                   // Picture parameter set
    
                              00 00 00 36 09 01 // AVC NALU
    
94 9A 00 00 00 00 00 00 00 17 01 00 00 00
    
                                          00 01 // ?
    
94 91
    
      65                                        // IDR frame
    
        [B8 04 1D FF ...]
    
00 01 94 A5 09 00 00 05 00 00 00 00 00 00 00    // ?
    
                                             17 // AVC sequence end
    
02 00 00 00 00 00 00 10

    Encoding first

    ffmpeg -f h264 -i "input.h264" -c:v h264_nvenc -f h264 "reencode.h264"

    reencode.h264

    00 00 00 01 67 4D 40 20 95 A0 13 81 F7 EB 01 10 // Sequence parameter set
    
00 00 3E 80 00 0E A6 08 F1 C3 2A
    
                                 00 00 00 01 68 // Picture parameter set
    
EE 3C 80
    
         00 00 00 01 65                         // IDR frame
    
                       [B8 04 1D FF ...]        // Frame data

    Squeeze into container

    ffmpeg -f h264 -i "reencode.h264" -c copy -f flv "B.flv"

    B.flv

    46 4C 56 01 01 00 00 00 09 00 00 00 00 12 00 00 // FLV header + metadata
    
A4 00 00 00 00 00 00 00 02 00 0A 6F 6E 4D 65 74
    
61 44 61 74 61 08 00 00 00 07 00 08 64 75 72 61
    
74 69 6F 6E 00 3F A4 7A E1 47 AE 14 7B 00 05 77
    
69 64 74 68 00 40 93 80 00 00 00 00 00 00 06 68
    
65 69 67 68 74 00 40 8E F0 00 00 00 00 00 00 0D
    
76 69 64 65 6F 64 61 74 61 72 61 74 65 00 00 00
    
00 00 00 00 00 00 00 0C 76 69 64 65 6F 63 6F 64
    
65 63 69 64 00 40 1C 00 00 00 00 00 00 00 07 65
    
6E 63 6F 64 65 72 02 00 0D 4C 61 76 66 35 37 2E
    
37 31 2E 31 30 30 00 08 66 69 6C 65 73 69 7A 65
    
00 40 F9 5B 40 00 00 00 00 00 00 09
    
                                    00 00 00 AF // AVC sequence start
    
09 00 00 05 00 00 00 00 00 00 00 17 00 00 00 00
    

    
00 00 00 10 09 01 94 BD 00 00 00 00 00 00 00 17 // AVC NALU
    
01 00 00
    
         00 00 00 00 01 67 4D 40 20 95 A0 13 81 // Sequence parameter set
    
F7 EB 01 10 00 00 3E 80 00 0E A6 08 F1 C3 2A
    
                                             00 // Picture parameter set
    
00 00 01 68 EE 3C 80
    
                     00 00 00 01 65             // IDR frame
    
                                   [B8 04 1D FF // Frame data
    
...]
    
00 01 94 C8 09 00 00 05 00 00 00 00 00 00 00    // ?
    
                                             17 // AVC sequence end
    
02 00 00 00 00 00 00 10

    Update 08.08.2017 : Added input and output files for examination

  • ffmpeg concat error-unusual video

    19 juillet 2017, par Samhita vempatti

    I have been trying to concatenate two 48 seconds video bits to one using the following command

        ffmpeg -f concat -safe 0 -i C:\moviepy-master\concat.txt -c copy output.mp4

    When I played it using Windows media player the first 48 second plays fine but the player closes before playing the second bit .

    Then I tried to play it using VLC media player but in the second bit player but the audio and video are not in sync .

    Then I also tried giving inputs separately so the following error shows up

                C:\Users\SAMHITA VVNK>ffmpeg -f concat -safe 0 -i C:\moviepy-master\extract1.mp4
    
             -i C:\moviepy-master\extract2.mp4 -c copy -flags +global_header output.mp4
    
            ffmpeg version N-86723-g3b3501f Copyright (c) 2000-2017 the FFmpeg developers
    
              built with gcc 7.1.0 (GCC)
    
              configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e
    
            nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --
    
            enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
    
            --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li
    
            bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug -
    
            -enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl
    
            e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
    
            bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam
    
            e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
    
             --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable
    
            -libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
    
              libavutil      55. 67.100 / 55. 67.100
    
              libavcodec     57.100.103 / 57.100.103
    
              libavformat    57. 75.100 / 57. 75.100
    
              libavdevice    57.  7.100 / 57.  7.100
    
              libavfilter     6. 94.100 /  6. 94.100
    
              libswscale      4.  7.101 /  4.  7.101
    
              libswresample   2.  8.100 /  2.  8.100
    
              libpostproc    54.  6.100 / 54.  6.100
    
            C:\moviepy-master\extract1.mp4: Invalid data found when processing input

    These are the input file’s specifications are as follows
    C :\Users\SAMHITA VVNK>ffmpeg -i C :\moviepy-master\extract.mp4 -filter_complex "[
    0:v]setpts=0.5*PTS[v] ;[0:a]atempo=2.0" -map "[a]" extract1fast.mp4

        C:\Users\SAMHITA VVNK>ffmpeg -i C:\moviepy-master\extract2.mp4 -i C:\moviepy-mas
    
    ter\extract1.mp4
    
    ffmpeg version N-86723-g3b3501f Copyright (c) 2000-2017 the FFmpeg developers
    
      built with gcc 7.1.0 (GCC)
    
      configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e
    
    nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --
    
    enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
    
    --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li
    
    bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug -
    
    -enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl
    
    e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
    
    bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam
    
    e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
    
     --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable
    
    -libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
    
      libavutil      55. 67.100 / 55. 67.100
    
      libavcodec     57.100.103 / 57.100.103
    
      libavformat    57. 75.100 / 57. 75.100
    
      libavdevice    57.  7.100 / 57.  7.100
    
      libavfilter     6. 94.100 /  6. 94.100
    
      libswscale      4.  7.101 /  4.  7.101
    
      libswresample   2.  8.100 /  2.  8.100
    
      libpostproc    54.  6.100 / 54.  6.100
    
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\moviepy-master\extract2.mp4':
    
      Metadata:
    
        major_brand     : isom
    
        minor_version   : 512
    
        compatible_brands: isomiso2avc1mp41
    
        encoder         : Lavf57.56.101
    
      Duration: 00:00:49.00, start: 0.012993, bitrate: 785 kb/s
    
        Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yu
    
    v420p(tv, smpte170m/smpte170m/bt709), 640x360, 668 kb/s, 29.97 fps, 29.97 tbr, 1
    
    1988 tbn, 23976 tbc (default)
    
        Metadata:
    
          handler_name    : VideoHandler
    
        Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp,
    
     137 kb/s (default)
    
        Metadata:
    
          handler_name    : SoundHandler
    
    Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\moviepy-master\extract1.mp4':
    
      Metadata:
    
        major_brand     : isom
    
        minor_version   : 512
    
        compatible_brands: isomiso2avc1mp41
    
        encoder         : Lavf57.56.101
    
      Duration: 00:00:49.00, start: 0.012993, bitrate: 526 kb/s
    
        Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [
    
    SAR 1:1 DAR 16:9], 462 kb/s, 24.86 fps, 24.86 tbr, 19888 tbn, 49.72 tbc (default
    
    )
    
        Metadata:
    
          handler_name    : VideoHandler
    
        Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, flt
    
    p, 95 kb/s (default)
    
        Metadata:
    
          handler_name    : SoundHandler

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