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• How to write mp4 metadata with ffmpeg without affecting the video data

  13 juillet 2018, par Daniel Quinn

  I’m trying to write metadata to a video file in one step, and capture the "raw data" (no metadata) portion of a video file in another step. The trouble is, with MP4 files, adding metadata to the file appears to alter the raw video data as well, while MKV files act as expected. Here’s an example with two files : test.mkv and test.mp4 :

  MKV

  ffmpeg -i test.mkv -loglevel error -metadata 'arbitrary=string' -codec copy test-new-metadata.mkv
  
  
  
  ffmpeg -i test.mkv              -loglevel error -map 0:v:0 -c copy -f data - -map 0:a:0 -c copy -f data - | md5sum
  
  631becf821dca89b150120d25393491a  -
  
  
  
  ffmpeg -i test-new-metadata.mkv -loglevel error -map 0:v:0 -c copy -f data - -map 0:a:0 -c copy -f data - | md5sum
  
  631becf821dca89b150120d25393491a  -

  MP4

  ffmpeg -i test.mp4 -loglevel error -metadata 'arbitrary=string' -codec copy test-new-metadata.mp4
  
  
  
  ffmpeg -i test.mp4              -loglevel error -map 0:v:0 -c copy -f data - -map 0:a:0 -c copy -f data - | md5sum
  
  b9b28e4ac500be961bd07290a34cf93f  -
  
  
  
  ffmpeg -i test-new-metadata.mp4 -loglevel error -map 0:v:0 -c copy -f data - -map 0:a:0 -c copy -f data - | md5sum
  
  d13e7177fae9b341994bc1ee8f3812bc  -

  ...and now webm, just to see if I’m losing my mind :

  Webm

  ffmpeg -i test.webm -loglevel error -metadata 'arbitrary=string' -codec copy test-new-metadata.webm
  
  
  
  ffmpeg -i test.webm              -loglevel error -map 0:v:0 -c copy -f data - -map 0:a:0 -c copy -f data - | md5sum
  
  a62e053d3dbf627db4d77c5165152a81  -
  
  
  
  ffmpeg -i test-new-metadata.webm -loglevel error -map 0:v:0 -c copy -f data - -map 0:a:0 -c copy -f data - | md5sum
  
  a62e053d3dbf627db4d77c5165152a81  -

  So I’m left wondering if my understanding of how to capture the raw video is misinformed, or if MP4 is "special" in some way. Note that I’m not interested in using ffmpeg’s own hashing functions as I want to run the raw data through an external process. The use of md5sum here is just to test if the output is identical.

  Update : As requested, I’m including the output of the metadata writing step for MP4 files :

  $ ffmpeg -i test.mp4 -metadata 'arbitrary=string' -codec copy test-new-metadata.mp4
  
  ffmpeg version 4.0.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 8.1.1 (GCC) 20180531
  
    configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvenc --enable-omx --enable-shared --enable-version3
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      creation_time   : 2010-03-20T21:29:11.000000Z
  
      encoder         : HandBrake 0.9.4 2009112300
  
    Duration: 00:00:05.57, start: 0.000000, bitrate: 551 kb/s
  
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 560x320, 465 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
  
      Metadata:
  
        creation_time   : 2010-03-20T21:29:11.000000Z
  
        encoder         : JVT/AVC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 83 kb/s (default)
  
      Metadata:
  
        creation_time   : 2010-03-20T21:29:11.000000Z
  
  Output #0, mp4, to 'test-new-metadata.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      arbitrary       : string
  
      encoder         : Lavf58.12.100
  
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 560x320, q=2-31, 465 kb/s, 30 fps, 30 tbr, 90k tbn, 90k tbc (default)
  
      Metadata:
  
        creation_time   : 2010-03-20T21:29:11.000000Z
  
        encoder         : JVT/AVC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 83 kb/s (default)
  
      Metadata:
  
        creation_time   : 2010-03-20T21:29:11.000000Z
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  166 fps=0.0 q=-1.0 Lsize=     377kB time=00:00:05.54 bitrate= 556.7kbits/s speed=4.07e+03x    
  
  video:315kB audio:56kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.609490%

  Update 2 : Here’s a link to the misbehaving mp4 file (375k).

• Chaining drawtext to overlay in FFMPEG

  14 juillet 2018, par alan samuel

  I am trying to add some text to a video using draw text. Is it also possible to use fontcolor to white ?

  Here is my command I am trying

  ffmpeg -i test.mp4 -i Watermark.png -filter_complex "[0:v][1:v] overlay=0:0:enable='between(t,5,30)'[v]; [0]volume=0:enable='between(t,5,30)'[a];drawtext=fontsize=50:fontfile=FreeSerif.ttf:text='This screen is redacted':x=(w-text_w)/2:y=(h-text_h)/2" -map "[v]" -map "[a]" -preset ultrafast output.mp4

  I get - Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_drawtext_2

  With the below answer it is failing for this video.

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'austin.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2018-07-14T04:40:00.000000Z
  
      location        : -34.8857+138.5805/
  
      location-eng    : -34.8857+138.5805/
  
      com.android.version: 8.1.0
  
      com.android.capture.fps: 30.000000
  
    Duration: 00:01:12.00, start: 0.000000, bitrate: 48200 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, smpte170m), 3840x2160, 48060 kb/s, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        creation_time   : 2018-07-14T04:40:00.000000Z
  
        handler_name    : VideoHandle
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 96 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-07-14T04:40:00.000000Z
  
        handler_name    : SoundHandle

  I keep getting this error :

  x264 [error] : malloc of size 22688384 failedme=00:00:01.00 bitrate= 0.4kbits/s

  speed=   1x
  
  Video encoding failed
  
  [aac @ 000002727e589f00] Qavg: 4246.095
  
  [aac @ 000002727e589f00] 2 frames left in the queue on closing
  
  Conversion failed!

• ffmpeg concat and preserve metadata streams

  16 décembre 2024, par Andrew

  I'm trying to concat multiple files that are the result of a GoPro Hero6 splitting movies to avoid the FAT 4GB limit. ffmpeg works great for this purpose but I need the telemetry data that is encoded in the metadata streams, and ffmpeg by default doesn't seem to preserve this. Using the ffprobe command you can see that the source videos have :

  



  Stream #0:3(eng): Data: none (gpmd / 0x646D7067), 36 kb/s (default)
Metadata:
  creation_time   : 2018-07-15T16:16:26.000000Z
  handler_name    : GoPro MET


  



  I know from research that this is the stream I need (although I'd like to be able to copy all streams). However when using ffmpeg -f concat the output is :

  



  [concat @ 0x7febb9800000] Could not find codec parameters for stream 2 (Unknown: none): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[concat @ 0x7febb9800000] Could not find codec parameters for stream 3 (Unknown: none): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[concat @ 0x7febb9800000] Could not find codec parameters for stream 4 (Unknown: none): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, concat, from 'tmp.txt':
  Duration: N/A, start: 0.000000, bitrate: 66194 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709), 2704x1520 [SAR 1:1 DAR 169:95], 66005 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc
    Metadata:
      creation_time   : 2018-07-15T16:08:22.000000Z
      handler_name    : GoPro AVC
      encoder         : GoPro AVC encoder
      timecode        : 16:23:48:21
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s
    Metadata:
      creation_time   : 2018-07-15T16:08:22.000000Z
      handler_name    : GoPro AAC
      timecode        : 16:23:48:21
    Stream #0:2: Unknown: none
    Stream #0:3: Unknown: none
    Stream #0:4: Unknown: none
Output #0, mp4, to 'GH0089.MP4':
  Metadata:
    encoder         : Lavf58.12.100
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709), 2704x1520 [SAR 1:1 DAR 169:95], q=2-31, 66005 kb/s, 0.02 fps, 59.94 tbr, 60k tbn, 60k tbc
    Metadata:
      creation_time   : 2018-07-15T16:08:22.000000Z
      handler_name    : GoPro AVC
      encoder         : GoPro AVC encoder
      timecode        : 16:23:48:21
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s
    Metadata:
      creation_time   : 2018-07-15T16:08:22.000000Z
      handler_name    : GoPro AAC
      timecode        : 16:23:48:21
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help


  



  The warnings Could not find codec parameters are especially interesting and Stream mapping shows that only the video and audio streams are mapped. I've played around with map_metadata to no avail. I may not have the format right but it seems more likely that the issue is related to the warning as the codecs are not recognized and I would expect all streams to be mapped by default.

  



  I would expect or hope for an answer that ignore the warnings and map the unrecognized streams without attempting to understand them.

  



  Any help is appreciated.