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• Combine two Videos with different framerates using ffmpeg

  3 juin 2021, par Patola

  ffmpeg -f concat -i mylist.txt -c copy output.mp4


  


  Combined video produced by above command is 17 mins. I think its because of the framerates. Is there a way to get proper output.

  


  Is there a tool I can use to change the framerate of one vid to match the other.

  


  Please see text below to see configurations of two videos.

  


  ffmpeg version 4.4-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Full.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp41isom
    creation_time   : 2021-06-01T10:57:14.000000Z
  Duration: 00:08:57.08, start: 0.000000, bitrate: 2527 kb/s
  Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 2526 kb/s, 30.30 fps, 30.30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2021-06-01T10:57:14.000000Z
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:11.93, start: 0.000000, bitrate: 20939 kb/s
  Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 20973 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
File 'output.mp4' already exists. Overwrite? [y/N] y
Output #0, mp4, to 'output.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp41isom
    encoder         : Lavf58.76.100
  Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 2526 kb/s, 30.30 fps, 30.30 tbr, 30k tbn, 30k tbc (default)
    Metadata:
      creation_time   : 2021-06-01T10:57:14.000000Z
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #1:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=16275 fps=0.0 q=-1.0 Lsize=  165734kB time=00:08:57.04 bitrate=2528.1kbits/s speed=3.02e+03x
video:165653kB audio:3kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.047347%


  


• FFmpeg possible bug with -pre flag

  5 juin 2021, par Slav

  I was studying the ffpresets and avpresets but I stumbled upon something interesting.

  


  According to the ffmpeg docs :

  


  


  First ffmpeg searches for a file named codec_name-arg.avpreset in the above-mentioned directories, where codec_name is the name of the codec to which the preset file options will be applied. For example, if you select the video codec with -vcodec libvpx and use -pre 1080p, then it will search for the file libvpx-1080p.avpreset.

  


  


  


  If no such file is found, then ffmpeg will search for a file named arg.avpreset in the same directories.

  


  


  I have a preset stored in the correct directory :

  


  $ ls ~/.avconv/
libvpx-1080p.avpreset


  


  Therefore, the following command should work :

  


  $ ffmpeg -i input.mp4 -vcodec libvpx -pre 1080p output.mp4 


  


  But instead it results in the follwing error :

  


  Preset 1080p specified for stream 0:1, but could not be opened.


  


  However, the following command works :

  


  ffmpeg -i input.mp4 -vcodec libvpx -pre libvpx-1080p output.mp4


  


  Is this a bug or am I misunderstanding the docs ?

  


  EDIT : I originally tried with the latest ffmpeg version available from the repositories (4.3.1). However, I then decided to confirm this is still the case with the latest version built from source, which yields :

  


  ~/Downloads/FFmpeg$ ./ffmpeg --version
ffmpeg version N-102649-g3ac7d99428 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 10 (Ubuntu 10.2.0-13ubuntu1)
configuration: --disable-x86asm --enable-libvpx
libavutil      57.  0.100 / 57.  0.100
libavcodec     59.  1.100 / 59.  1.100
libavformat    59.  2.101 / 59.  2.101
libavdevice    59.  0.100 / 59.  0.100
libavfilter     8.  0.101 /  8.  0.101
libswscale      6.  0.100 /  6.  0.100
libswresample   4.  0.100 /  4.  0.100


  


  EDIT 2 : Adding the whole log of the failing command as requested

  


  $ ./ffmpeg -i ../input.mp4 -vcodec libvpx -pre 1080p ../output.mp4
ffmpeg version N-102649-g3ac7d99428 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10 (Ubuntu 10.2.0-13ubuntu1)
  configuration: --disable-x86asm --enable-libvpx
  libavutil      57.  0.100 / 57.  0.100
  libavcodec     59.  1.100 / 59.  1.100
  libavformat    59.  2.101 / 59.  2.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  0.101 /  8.  0.101
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../input.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41isomavc1
    creation_time   : 2015-08-07T09:13:36.000000Z
  Duration: 00:00:30.53, start: 0.000000, bitrate: 4675 kb/s
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 4486 kb/s, 30 fps, 30 tbr, 30 tbn (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:36.000000Z
      handler_name    : L-SMASH Video Handler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:36.000000Z
      handler_name    : L-SMASH Audio Handler
      vendor_id       : [0][0][0][0]
Preset 1080p specified for stream 0:1, but could not be opened.


  


• Gstreamer preserve timestamp when encoding ts segments

  1er juillet 2021, par Guru Govindan

  I have a series of ts files(h265) which are part of a m3u8 manifest which are fed into the pipeline through fdsrc. I use the following pipeline to transcode them to H264 to be played on a Hlsjs web browser.

  


  cat 2021-06-30T00-55-41Z_2000000.ts | gst-launch-1.0  -q mpegtsmux name=mux ! fdsink fd=1 fdsrc ! tsdemux name=demux demux. ! queue ! h265parse ! nvh265dec ! videoconvert ! videoscale ! video/x-raw,width=640,height=360 ! nvh264enc ! mux.


  


  The individual ts segments are transcoded successfully and can be played.

  


  However the DTS is out of aligment and when these ts segments are played as part of the hls manifest, it is not able to play as DTS is out of order.

  


  [mpegts @ 0x7fb69100a400] DTS 6496420096 < 6496446847 out of order
[hls @ 0x7fb69580ea00] DTS 6496420096 < 6496446847 out of order


  


  In FFMPEG we have copyts to preserve the timestamp.
Is there something similar in gstreamer to preserve the timestamp ? Or atleast generate a timestamp with the current time so that the player doesnt complain ?

  


  I tried fdsrc do-timestamp=true but that didnt work.

  


  I appreciate any help in this.

  


  Best