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• FFmpeg - Generating waveform image from webm file not working due to overlay filter

  18 juillet 2018, par jfizz

  I am attempting to generate a waveform image from a webm file. I am using the overlay filter to overlay the waveform atop a background. The waveform does not show whenever the overlay filter is used. The failing command :

  ffmpeg -i big_buck_bunny.webm -filter_complex "showwavespic=s=640x120[fg];color=s=640x120:color=#ff0000[bg];[bg][fg]overlay=format=auto" -frames:v 1 output.jpg

  The result :

  

  I have also tried using an image as the background with the same result :

  ffmpeg -i big_buck_bunny.webm -i bg.jpg -filter_complex "showwavespic=s=640x120[fg];[1:v][fg]overlay=format=auto" -frames:v 1 output.jpg

  Generating a waveform without a background works as expected :

  ffmpeg -i big_buck_bunny.webm -filter_complex "showwavespic=s=640x120" -frames:v 1 output.jpg

  

  Here is the video I am using.

  I have tried various webm files with the same result. I also tested some .mp4,.mov,.ogv files which worked as expected. I am using the latest ffmpeg version, below is my banner.

  ffmpeg version 4.0.1 Copyright (c) 2000-2018 the FFmpeg developers
  
  built with Apple LLVM version 9.1.0 (clang-902.0.39.2)
  
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.1 --enable-shared -- 
  
  enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  
  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

• 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.

  


• 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!