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• idb & Ffmpeg hls video is taking lot of time to start creating video

  24 avril 2024, par aksh02

  I'm trying to capture a simulator's screen using idb & ffmpeg with the command

  


  idb video-stream --fps 15 --format h264 --compression-quality 1.0 --udid <udid> | ffmpeg -i pipe:0 -vcodec libx264 -threads 1 -crf 40 -preset ultrafast -f hls -g 30 -hls_list_size 0 -hls_time 5 -r 15 ./index.m3u8&#xA;</udid>

  


  This is taking around 15s to create the index.m3u8 file resulting in the loss of first 15 seconds of video.
I've tried adding

  


  -tune zerolatency


  


  but this too has no effect.
Idb starts video streaming right away on its own. Need help triaging why ffmpeg is processing it so late. The output ffmpeg provides when it eventually starts writing to ts files

  


  Input #0, h264, from 'pipe:0':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High), yuvj420p(pc, progressive), 1178x2556, 25 fps, 25 tbr, 1200k tbn, 50 tbc


  


  ffmpeg -version

  


  ffmpeg version N-92246-gc2ac3b8e6a-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2018 the FFmpeg developers
built with Apple LLVM version 10.0.0 (clang-1000.11.45.2)
configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
libavutil      56. 19.101 / 56. 19.101
libavcodec     58. 33.102 / 58. 33.102
libavformat    58. 19.102 / 58. 19.102
libavdevice    58.  4.106 / 58.  4.106
libavfilter     7. 37.100 /  7. 37.100
libswscale      5.  2.100 /  5.  2.100
libswresample   3.  2.100 /  3.  2.100
libpostproc    55.  2.100 / 55.  2.100


  


• pydub - setting the start time of an audio file ? [closed]

  3 février, par tamirg

  I have an audio file, which I create using pydub, and when I use ffmpeg to play I notice it has a start time defined :

  


  Input #0, mpeg, from 'audio_117.ts':
Duration: 00:00:09.91, start: 0.500000, bitrate: 66 kb/s


  


  I am trying to play the same audio file but with different formats. And I notice the start time is different with each format. :

  


  mp3 :

  


  Input #0, mp3, from 'audio_117.mp3':
  Metadata:
    encoder         : Lavf61.7.100
  Duration: 00:00:10.03, start: 0.023021, bitrate: 64 kb/s


  


  ogg :

  


  Input #0, ogg, from 'audio_117.ogg':
  Duration: 00:00:10.00, start: 0.000000, bitrate: 63 kb/s


  


  Do I have any control over this attribute ? What does it mean exactly ?
I just notice that if I create an HLS playlist from such file, it skips the beginning, and I wonder if it is related to the start time attribute.

  


• fftools/ffmpeg : move elapsed time counter to the end of the status line

  9 mai, par Marton Balint

  fftools/ffmpeg : move elapsed time counter to the end of the status line
  Elapsed time is much less important than the actual progress, and I am guessing
  
  several ffmpeg CLI frontends use the existing status line for showing progress,
  
  so putting a new field in the beginning is less optimal anyway.
  Related to ticket #11582.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] fftools/ffmpeg.c