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Sur d’autres sites (2959)

  • ffmpeg : specify/force pixel format for input H.264 video

    30 juillet 2017, par AndreG

    I have some MP4 video files missing the pixel format in their header information. I have already tried setting probesize and analyzeduration to their maximum values 2147483647 but that didn’t help.

    So I know these videos are probably corrupt but if this is the only information missing I was thinking I could maybe recover them by rebuilding their header information or somehow decoding them by forcing a pixel format. Does anyone have any idea if this is possible ? Some more background on the file :

    Mediainfo :

    $ mediainfo DJI_0090.MOV 
    
General
    
Complete name                            : DJI_0090.MOV
    
Format                                   : MPEG-4
    
Format profile                           : QuickTime
    
Codec ID                                 : qt   2014.02 (qt  )
    
File size                                : 165 MiB
    
Duration                                 : 22 s 322 ms
    
Overall bit rate mode                    : Variable
    
Overall bit rate                         : 61.8 Mb/s
    
Encoded date                             : UTC 2017-05-31 18:04:45
    
Tagged date                              : UTC 2017-05-31 18:04:45
    
Comment                                  : 0.9.145
    
©gpt                                     : -170.60
    
©gyw                                     : +157.30
    
©grl                                     : +0.00
    
IsTruncated                              : Yes
    

    
Video
    
ID                                       : 1
    
Format                                   : AVC
    
Format/Info                              : Advanced Video Codec
    
Format profile                           : High@L4.2
    
Format settings, CABAC                   : Yes
    
Format settings, RefFrames               : 1 frame
    
Codec ID                                 : avc1
    
Codec ID/Info                            : Advanced Video Coding
    
Duration                                 : 22 s 322 ms
    
Bit rate mode                            : Variable
    
Bit rate                                 : 59.4 Mb/s
    
Maximum bit rate                         : 50.0 Mb/s
    
Width                                    : 1 920 pixels
    
Height                                   : 1 080 pixels
    
Display aspect ratio                     : 16:9
    
Frame rate mode                          : Constant
    
Frame rate                               : 59.940 (60000/1001) FPS
    
Color space                              : YUV
    
Chroma subsampling                       : 4:2:0
    
Bit depth                                : 8 bits
    
Scan type                                : Progressive
    
Bits/(Pixel*Frame)                       : 0.478
    
Stream size                              : 158 MiB (96%)
    
Title                                    : DJI.AVC
    
Language                                 : English
    
Encoded date                             : UTC 2017-05-31 18:04:45
    
Tagged date                              : UTC 2017-05-31 18:04:45
    
Color range                              : Limited
    
Color primaries                          : BT.709
    
Transfer characteristics                 : BT.709
    
Matrix coefficients                      : BT.709

    ffprobe :

    $ ffprobe -analyzeduration 2147483647 -probesize 2147483647 DJI_0090.MOV 
    
ffprobe version 3.3.2 Copyright (c) 2007-2017 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= --disable-indev=qtkit --enable-ffplay --enable-libfdk-aac --enable-libmp3lame     --enable-libsoxr --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --enable-opencl --disable-lzma     --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.1.2_1/include/openjpeg-2.1 --enable-nonfree     --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
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fc2e9002600] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 1920x1080):     unspecified pixel format
    
Consider increasing the value for the 'analyzeduration' and 'probesize' options
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'DJI_0090.MOV':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 538182144
    
    compatible_brands: qt  
    
    creation_time   : 2017-05-31T18:04:45.000000Z
    
    comment         : 0.9.145
    
  Duration: 00:00:22.36, bitrate: 61732 kb/s
    
    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), none, 1920x1080, 59.94 fps, 59.94 tbr, 60k tbn, 120k tbc (default)
    
    Metadata:
    
      creation_time   : 2017-05-31T18:04:45.000000Z
    
      handler_name    : DJI.AVC
    
      encoder         : Dji AVC encoder

    I can’t force the pixel_format on ffmpeg this way :

    $ ffmpeg -pixel_format yuv420p -i DJI_0090.MOV test.mp4
    
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= --disable-indev=qtkit --enable-ffplay --enable-libfdk-aac --enable-libmp3lame     --enable-libsoxr --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --enable-opencl --disable-lzma     --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.1.2_1/include/openjpeg-2.1 --enable-nonfree     --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
    
Option pixel_format not found.

    Is there any other way to accomplish this with ffmpeg ? Is it possible to edit their header information to include the pixel format information ?

  • 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 recognises MXF dv but won't encode to h264

    6 août 2017, par 3pointedit

    I have a DV file encoded as an MXF that I want to transcode to h264. Running ffmpeg against the file it reads ok and understands the stream but won’t write the h264 file. It seems to get all the streams correct and I can confirm the attributes of video and audio streams.

    I just don’t understand why it won’t encode ? I tried to force a Decoder with -f dv but it complained that the source header was incorrect.

     ./ffmpeg -f dv -i camb_onitefire_050914.mov  camb_onitefire_A.mp4
    
ffmpeg version 3.3.1 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
    
  configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
    
  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
    
  libswscale      4.  6.100 /  4.  6.100
    
  libswresample   2.  7.100 /  2.  7.100
    
  libpostproc    54.  5.100 / 54.  5.100
    
[dv @ 0x7fd6f4800000] Cannot find DV header.
    
camb_onitefire_050914.mov: Operation not permitted
    
Davids-MacBook-Pro:camb_onitefire_050914(1).vmf davidmcsween$ ./ffmpeg -i camb_onitefire_050914.mov camb_onitefire_A.mp4
    
ffmpeg version 3.3.1 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
    
  configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
    
  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
    
  libswscale      4.  6.100 /  4.  6.100
    
  libswresample   2.  7.100 /  2.  7.100
    
  libpostproc    54.  5.100 / 54.  5.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fe1fb000000] Skipped opening external track: stream 0, alias: path='/VibrintAVFiles/P2 News Ingest/camb_onitefire_050914(1).vmf/video.vid', dir='camb_onitefire_050914(1).vmf', filename='video.vid', volume='default', nlvl_from=1, nlvl_to=1.Set enable_drefs to allow this.
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fe1fb000000] Skipped opening external track: stream 1, alias: path='/VibrintAVFiles/P2 News Ingest/camb_onitefire_050914(1).vmf/audio_0.pcm', dir='camb_onitefire_050914(1).vmf', filename='audio_0.pcm', volume='default', nlvl_from=1, nlvl_to=1.Set enable_drefs to allow this.
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fe1fb000000] Skipped opening external track: stream 2, alias: path='/VibrintAVFiles/P2 News Ingest/camb_onitefire_050914(1).vmf/audio_1.pcm', dir='camb_onitefire_050914(1).vmf', filename='audio_1.pcm', volume='default', nlvl_from=1, nlvl_to=1.Set enable_drefs to allow this.
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fe1fb000000] Skipped opening external track: stream 3, alias: path='/VibrintAVFiles/P2 News Ingest/camb_onitefire_050914(1).vmf/audio_2.pcm', dir='camb_onitefire_050914(1).vmf', filename='audio_2.pcm', volume='default', nlvl_from=1, nlvl_to=1.Set enable_drefs to allow this.
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fe1fb000000] Skipped opening external track: stream 4, alias: path='/VibrintAVFiles/P2 News Ingest/camb_onitefire_050914(1).vmf/audio_3.pcm', dir='camb_onitefire_050914(1).vmf', filename='audio_3.pcm', volume='default', nlvl_from=1, nlvl_to=1.Set enable_drefs to allow this.
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fe1fb000000] Could not find codec parameters for stream 0 (Video: dvvideo (dvpp / 0x70707664), none, 720x576, 28800 kb/s): unspecified pixel format
    
Consider increasing the value for the 'analyzeduration' and 'probesize' options
    
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 : mono
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'camb_onitefire_050914.mov':
    
  Metadata:
    
    creation_time   : 2014-09-04T18:54:07.000000Z
    
  Duration: 00:17:47.18, start: 0.000000, bitrate: 1 kb/s
    
    Stream #0:0(eng): Video: dvvideo (dvpp / 0x70707664), none, 720x576, 28800 kb/s, SAR 118:81 DAR 295:162, 25 fps, 25 tbr, 2500 tbn, 2500 tbc (default)
    
    Metadata:
    
      creation_time   : 2014-09-04T18:54:07.000000Z
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 01:46:43:02
    
    Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16, 768 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-09-04T18:54:07.000000Z
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:2(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16, 768 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-09-04T18:54:07.000000Z
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:3(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16, 768 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-09-04T18:54:07.000000Z
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:4(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16, 768 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-09-04T18:54:07.000000Z
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:5(eng): Data: none (tmcd / 0x64636D74) (default)
    
    Metadata:
    
      creation_time   : 2014-09-04T18:54:07.000000Z
    
      handler_name    : Apple Handle Data Handler
    
      timecode        : 01:46:43:02
    
File 'camb_onitefire_A.mp4' already exists. Overwrite ? [y/N] y
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (dvvideo (native) -> h264 (libx264))
    
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
    
Press [q] to stop, [?] for help
    
Finishing stream 0:0 without any data written to it.
    
Finishing stream 0:1 without any data written to it.
    
Nothing was written into output file 0 (camb_onitefire_A.mp4), because at least one of its streams received no packets.
    
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=-577014:32:22.77 bitrate=  -0.0kbits/s speed=N/A    
    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
    
[aac @ 0x7fe1fd010e00] Qavg: nan

    Heres an example of the file structure of this novel mxd :

    mxf example

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