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• FFMPEG missing audio when remuxing AVI to MP4

  24 juillet 2022, par Joba

  I want to convert from .avi to .mp4 without any quality impact.

  


  When I use ffmpeg cli to remux the file the output file is missing the audio.

  


  


  ffmpeg -i input.mpg.avi -c copy output.mp4

  


  


  ➜  Desktop ffmpeg -i input.mpg.avi -c copy output.mp4
ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.0.1_3 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
Input #0, avi, from 'input.mpg.avi':
  Metadata:
    software        : transcode-1.0.6
  Duration: 01:45:46.56, start: 0.000000, bitrate: 2055 kb/s
  Stream #0:0: Video: mpeg4 (Simple Profile) (DX50 / 0x30355844), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1915 kb/s, 25 fps, 25 tbr, 25 tbn
  Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, fltp, 128 kb/s
Output #0, mp4, to 'output.mp4':
  Metadata:
    software        : transcode-1.0.6
    encoder         : Lavf59.16.100
  Stream #0:0: Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=2-31, 1915 kb/s, 25 fps, 25 tbr, 12800 tbn
  Stream #0:1: Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=158664 fps=142852 q=-1.0 Lsize= 1587337kB time=01:45:46.55 bitrate=2048.9kbits/s speed=5.71e+03x    
video:1483615kB audio:99165kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.287948%


  


• Parsing custom track data from ARCore mp4 recordings

  11 juillet 2022, par George Ellickson

  I'm using the Android ARCore Recording API to record custom data per frame and replay those values in tests to instrument test our ARCore functionality on devices and in CI. However, separately I'd also like to parse the generated mp4 recordings myself, outside of ARCore, and use my per frame recorded data for analysis. In my ARCore app, I'd like to simply be able to add custom text data like following, encoded as utf-8 strings (or really any other simple encoding) for the given ARCore frame :

  


  val data = "Hello world!"
val buffer = ByteBuffer.wrap(data.encodeToByteArray())
frame.recordTrackData(TRACK_UUID_MY_DATA, buffer


  


  I can't find any docs or good examples though of parsing the mp4 from ARCore and no luck in their arcore-android-sdk repo either. I've tried ffmpeg / ffprobe to figure out how the data is bundled into the MP4, but I'm stumped on which track to use and how best to deserialize as I'm unsure how the bytes are actually encoded under the hood.

  


  Using ffmpeg, I just get information like this about the tracks :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'HoverCapture/ar-recording-tests/src/androidTest/res/raw/ar_recording_2_photos.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2022-01-20T22:03:13.000000Z
  Duration: 00:00:17.12, start: 0.000000, bitrate: 26865 kb/s
  Stream #0:0[0x1](und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, unknown/bt470bg/unknown, progressive), 1920x1080, 25615 kb/s, 28.08 fps, 29.58 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Data: none (mett / 0x7474656D), 18 kb/s (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
  Stream #0:2[0x3](und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, unknown/bt470bg/unknown, progressive), 640x480, 1929 kb/s, 28.12 fps, 29.42 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
      vendor_id       : [0][0][0][0]
  Stream #0:3[0x4](und): Data: none (mett / 0x7474656D), 18 kb/s (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
  Stream #0:4[0x5](und): Data: none (mett / 0x7474656D), 54 kb/s (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
  Stream #0:5[0x6](und): Data: none (mett / 0x7474656D), 54 kb/s (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
  Stream #0:6[0x7](und): Data: none (mett / 0x7474656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
  Stream #0:7[0x8](und): Data: none (mett / 0x7474656D), 6 kb/s (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.


  


• FFMPEG:Invalid buffer size when converting video

  30 juillet 2022, par Sar sinua

  I'm trying to Pipe bytes in to FFMPEG in python and I've faced a problem.

  


  import subprocess
from io import BytesIO

with open('input.mp4', 'rb') as f:
    input_byte=f.read()
command='ffmpeg -y -f rawvideo -video_size 320x240 -pixel_format yuv420p -framerate 15 -i pipe:0 -codec:a copy out.mp4'
process = subprocess.Popen(command, stdin=subprocess.PIPE, shell=True)

process.stdin.write(input_byte)
process.stdin.close()


  


  The error I get is Invalid buffer size, packet size 63420 < expected frame_size 115200 Error while decoding stream #0:0: Invalid argument

  


  You can download the video from here.

  


  ffmpeg version 2022-05-12-git-30e2bb0f64-full_build-www.gyan.dev