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• FFmpeg merge two files from different sources with different bitrates

  2 mars 2023, par FamousWolluf

  I have created an intro video with Adobe Premiere Pro and I want to add the intro video to my downloaded Mixer stream videos before uploading them to YouTube, without reencoding the complete video through Adobe Premiere because that takes a long time because the videos are more then an hour.

  



  I tried it with FFmpeg ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4.
The intro is normal but the video part from Mixer is running way to fast.
  
I think it has something todo with the bitrate but I can't figure it out.

  



  Output of intro file :

  



    Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2020-05-12T11:12:11.000000Z
  Duration: 00:00:06.06, start: 0.000000, bitrate: 2408 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2086 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      creation_time   : 2020-05-12T11:12:11.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      encoder         : AVC Coding
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    Metadata:
      creation_time   : 2020-05-12T11:12:11.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler


  



  Output of Mixer file :

  



    Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.12.100
  Duration: 01:02:00.58, start: 0.000000, bitrate: 1937 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720, 1800 kb/s, 29.41 fps, 29.97 tbr, 16k tbn, 32k tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  



  Output of the merged file :

  



    Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.43.100
  Duration: 00:57:03.84, start: 0.000000, bitrate: 2109 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 3377 kb/s, 55.14 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : ?Mainconcept Video Media Handler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 140 kb/s (default)
    Metadata:
      handler_name    : #Mainconcept MP4 Sound Media Handler


  



  If I need to reencode something my preference would be the intro because it's only 6 seconds.

  


• avformat/mpegts : Shuffle avio_seek

  7 mai 2020, par Michael Niedermayer

  avformat/mpegts : Shuffle avio_seek
  This avoids accessing an old, no longer valid buffer.
  
  Fixes : out of array access
  
  Fixes : crash_audio-2020
  Found-by : le wu <shoulewoba@gmail.com>
  
  Reviewed-by : Marton Balint <cus@passwd.hu>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/mpegts.c

• ffmpeg strftime no effect on windows

  18 mai 2020, par Ben

  I'm trying to auto mark the output file with timestamps with ffmpeg. Here's my test cmd :

  



  .\ffmpeg.exe -y -loglevel 99 -i test.mp3 -strftime 1 %Y.ogg


  



  I expected a file named 2020.ogg, however only got %Y.ogg. In another word, output filename is not processed by strftime(). I'm using powershell so there should be no relation with cmd's %% escaping.

  



  Here's the output : https://pastebin.com/LUVh2kFA I'm using static builds from https://ffmpeg.zeranoe.com (Thanks Zeranoe !) I confirmed that the problem exists in v4.2.2 and git-20200515. Is there any chance to fix it or am I doing it wrong ?