Recherche avancée

Sur d’autres sites (9530)

• ffmpeg : Concatenating videos with different codecs, sizes and formats [duplicate]

  10 juillet 2021, par Hitman47

  I am looking to concatenate a list of videos using ffmpeg that are of different sources, but the audio always goes out of sync and sometimes the playback speed goes wild.

  


  Even in the case of preconverting them separately to the same codec/size/frame rate, then trying to mux them together with codec copy, i get the same issues, so it must be something about mapping or timings.

  


  I am using the following parameters

  


  ffmpeg -f concat -safe 0 -i list.txt -map_metadata -1 -vf scale=480x270 -c:v libx265 -preset ultrafast -flags2 "fast" -vb 150k -max_interleave_delta 0 -r 22 -c:a opus -ab 30k -ac 1 -strict -2 -x265-params "--pmode --pme --ctu=32 --merange=20" output.mkv


  


  I have tried -max_interleave_delta 0 and disabling the experimental 'opus' codec and the nonstandard -flags2 "fast". The result is still broken

  


  These are the warnings i get in the output :
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x561090282280] Auto-inserting h264_mp4toannexb bitstream filter [concat @ 0x56108d88f400] DTS 1498384 < 4488000 out of order

  


  If this is very hard to pull off, would you suggest using something other than ffmpeg ?

  


• ffmpeg rtmp streaming at 30fps

  19 janvier 2018, par user6326558

  I am trying to stream my desktop to facebook rtmp server using screen-capture-recorder :

  ffmpeg -re  -f dshow -i audio="virtual-audio-capturer" -hwaccel cuvid 
  
  -f dshow -i video=screen-capture-recorder  -r 30 -rtbufsize 1024M 
  
  -filter:v scale=480:360 -vcodec libx264 
  
  -pix_fmt yuv420p -preset fast -b:v 8M -maxrate:v 10M  -c:a aac -b:a 128k 
  
  -ar 44100 -f flv rtmp://live-api.facebook.com:80/rtmp/..............

  But when I start streaming, it says that fps is only 10 and sometimes it immediatelly on start-up yells following error. Then, when I start to do something on my computer, for example I run a game, I keep getting that warning 20 times per second, and streamed video is 0.5 fps.

  real-time buffer [screen-capture-recorder] [video input] too full or near
  too full (545% of size : 3041280 [rtbufsize parameter]) ! frame dropped !

  When I stream it into file,

  ffmpeg -re  -f dshow -i audio="virtual-audio-capturer" -hwaccel cuvid 
  
  -f dshow -i video=screen-capture-recorder  -r 30 -rtbufsize 1024M 
  
  -filter:v scale=480:360 -vcodec libx264 
  
  -pix_fmt yuv420p -preset fast -b:v 8M -maxrate:v 10M  -c:a aac -b:a 128k 
  
  -ar 44100 D:\test.mp4 -y

  it says streaming is 30 fps, but as soon as I start doing something, for example game, the metioned situation repeats, tens of errors, and 0,5 fps video.

  I tried chanching -rtbufsize from 8 to 2048 megabytes, nothing changed. I tried adding and disablinh hw acceleration, nothing changed. Can anyone tell me, what am I doing wrong ? Thank you

  Solved -rtbufsize 1024M must be before -i. Another thing, I rather used codec h264_nvenc from nvidia for cuda acceleration, now I can stream into file at 30 fps without problems and warnings, even while playing game (Call of duty 6, HW draining). However, when I try to stream to rtmp, I also get no warnings, but I can stream at only 15 fps. Is it also possible to stream to rtmp at 30 fps with my command configuration ?

  If needed, my ffmpeg build config is :

  ffmpeg version 3.3.3 Copyright (c) 2000-2017 the FFmpeg developers

  built with gcc 7.1.0 (GCC)
  configuration : —disable-static —enable-shared —enable-gpl —enable-version3 —enable-cuda —enable-cuvid —enable-d3d11va —enable-dxva2 —enable-libmfx —enable-nvenc —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libfreetype —enable-libgme —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenh264 —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzimg —enable-lzma —enable-zlib

• riff : add PLV1 fourcc to mpeg4

  3 avril 2014, par Compn

  riff : add PLV1 fourcc to mpeg4
  Sample-Id : york-water-meteor.avi
  

  • [DBH] libavformat/riff.c