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• react-native - how to properly handle install of react-native-ffmpeg ?

  8 février 2021, par Eugene Goldberg

  I'm trying to add react-native-ffmpeg library to my react native (0.63.4) project.
I'm getting this error :

  


  npm install react-native-ffmpeg@latest
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: app@0.0.1
npm ERR! Found: react-native@0.63.4
npm ERR! node_modules/react-native
npm ERR!   react-native@"0.63.4" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer react-native@"^0.56.0" from react-native-ffmpeg@0.5.1
npm ERR! node_modules/react-native-ffmpeg
npm ERR!   react-native-ffmpeg@"0.5.1" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.


  


  Is there a way to add this library without having this dependency resolution issue ?

  


• Handle AVID MJPEG streams directly in the MJPEG decoder.

  12 décembre 2020, par Anton Khirnov

  Handle AVID MJPEG streams directly in the MJPEG decoder.
  AVID streams - currently handled by the AVRN decoder - can be (depending
  
  on extradata contents) either MJPEG or raw video. To decode the MJPEG
  
  variant, the AVRN decoder currently instantiates a MJPEG decoder
  
  internally and forwards decoded frames to the caller (possibly after
  
  cropping them).
  This is suboptimal, because the AVRN decoder does not forward all the
  
  features of the internal MJPEG decoder, such as direct rendering.
  
  Handling such forwarding in a full and generic manner would be quite
  
  hard, so it is simpler to just handle those streams in the MJPEG decoder
  
  directly.
  The AVRN decoder, which now handles only the raw streams, can now be
  
  marked as supporting direct rendering.
  This also removes the last remaining internal use of the obsolete
  
  decoding API.
  

  • [DH] configure
  • [DH] libavcodec/avrndec.c
  • [DH] libavcodec/mjpegdec.c
  • [DH] libavcodec/version.h
  • [DH] libavformat/avidec.c
  • [DH] libavformat/isom_tags.c
  • [DH] tests/fate/video.mak

• ffmpeg : handle videos with changing resolution

  5 mars 2021, par mSourire

  I write a program, which concatenates input list of videos programmatically. The problem is that these videos are parts of a recorded stream, and their resolution may change few times within the same file.
Currently, if that happens, ffmpeg fails, saying that it's not possible to concat files with different resolutions. Is there a way to make ffmpeg handling this automatically ? A good solution would be selective scaling of frames with unexpected resolution.

  


  Here is a listing :

  


  ffmpeg -y -i 1.mkv -i 1.mka
-max_muxing_queue_size 10000
-preset veryfast -r 30 -crf 20 -b:a 96000 -vbr on
-strict experimental
-filter_complex '
color=black:s=320x240:d=7ms[black0];
aevalsrc=0:d=15ms[silence1];
[black0][0]concat=n=2:v=1:a=0[video];
[1][silence1]concat=n=2:v=0:a=1[audio]'
-map [video] -map [audio] -c:v libvpx -c:a libopus output.webm

ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_9 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --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-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --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-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, matroska,webm, from '1.mkv':
  Metadata:
    encoder         : GStreamer matroskamux version 1.8.1.1
    creation_time   : 2021-03-02T13:44:03.000000Z
  Duration: 00:01:48.41, start: 0.710000, bitrate: 757 kb/s
    Stream #0:0(eng): Video: vp8, yuv420p(progressive), 320x240, SAR 1:1 DAR 4:3, 120 tbr, 1k tbn, 1k tbc (default)
    Metadata:
      title           : Video
Input #1, matroska,webm, from '1.mka':
  Metadata:
    encoder         : GStreamer matroskamux version 1.8.1.1
    creation_time   : 2021-03-02T13:44:03.000000Z
  Duration: 00:01:48.40, start: 0.703000, bitrate: 38 kb/s
    Stream #1:0(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
    Metadata:
      title           : Audio
Codec AVOption preset (Configuration preset) specified for output file #0 (output.webm) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Stream mapping:
  Stream #0:0 (vp8) -> concat:in1:v0
  Stream #1:0 (opus) -> concat:in0:a0
  concat -> Stream #0:0 (libvpx)
  concat -> Stream #0:1 (libopus)
Press [q] to stop, [?] for help
[libvpx @ 0x7fe08a80bc00] v1.9.0
[libvpx @ 0x7fe08a80bc00] Bitrate not specified for constrained quality mode, using default of 256kbit/sec
Output #0, webm, to 'output.webm':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: vp8 (libvpx), yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=-1--1, 256 kb/s, 30 fps, 1k tbn, 30 tbc (default)
    Metadata:
      encoder         : Lavc58.91.100 libvpx
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: opus (libopus), 48000 Hz, stereo, flt, 96 kb/s (default)
    Metadata:
      encoder         : Lavc58.91.100 libopus
[Parsed_color_0 @ 0x7fe089815940] EOF timestamp not reliable
[Parsed_concat_2 @ 0x7fe088501980] Input link in0:v0 parameters (size 640x480, SAR 1:1) do not match the corresponding output link in0:v0 parameters (320x240, SAR 1:1)
[Parsed_concat_2 @ 0x7fe088501980] Failed to configure output pad on Parsed_concat_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
[libopus @ 0x7fe08a810c00] 1 frames left in the queue on closing
Conversion failed!


  


  Here is the only such video with "floating" resolution, which cannot be concatenated with 320x240 color filter.