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• avutil/tests/dict : Explicitly test av_dict_iterate()

  3 décembre 2022, par Andreas Rheinhardt

  avutil/tests/dict : Explicitly test av_dict_iterate()
  This commit tests it in a way that automatically checks
  
  that using av_dict_iterate() is equivalent to using
  
  av_dict_get() with key "" and AV_DICT_IGNORE_SUFFIX.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavutil/tests/dict.c

• Why does FFmpeg's xfade filter need the timebase and frame rate to match ?

  17 novembre 2022, par Hashim Aziz

  As I discovered not long ago, and recently had to rediscover after trying to use it again, xfade - the crossfade filter that FFmpeg introduced in 2019 - requires that both inputs have a matching timebase (TBN) and frame rate (FPS).

  


  This is "resolved" by explicitly making them the same, by adding SETTB and a hardcoded FPS to both streams (there doesn't seem to be a constant equivalent to AVTB for FPS) prior to using xfade :

  


  -filter_complex \
[0:v]settb=AVTB,fps=29[v0];
[1:v]settb=AVTB,fps=29[v1];
[v0][v1]xfade=transition=fade:duration=$fadeduration:offset=$fadetime,format=yuv420p[faded]; 


  


  However, I'm confused as to why is this necessary in the first place. The concat filter works similarly in that requires all its inputs to have matching parameters, but this makes sense because the whole point of concat is to avoid re-encoding. If the xfade filter is (presumably) re-encoding anyway, why do the timebase and frame rate still need to match ?

  


  Is there a reason the devs decided to enforce these limitations for the filter when they don't seem to be technically necessary ?

  


• FFmpeg : how to stream multiple http outputs

  25 octobre 2022, par Caner Demir

  I'm assigned to search for a solution to stream more than one http output in ffmpeg. I tried the code below which uses pipe, but only the last output works, other ones don't work. The solutions I tried with tee muxer also couldn't work. Any idea how can I do that ?

  


  ffmpeg -re -i sample1.mp3 -i sample2.mp3 -filter_complex amix=inputs=2 -f mp3 pipe:1 | ffmpeg -f mp3 -re -i pipe:0 -c copy -listen 1 -f mp3 http://127.0.0.1:4000 -c copy -listen 1 -f mp3 http://127.0.0.1:4010


  


  The code I tried with tee muxer is below :

  


  ffmpeg -re -i sample1.mp3 -i sample2.mp3 -filter_complex amix=inputs=2 -c:a mp3 -f tee "[listen=1:f=mp3]http://127.0.0.1:4000|[listen=1:f=mp3]http://127.0.0.1:4010"


  


  edit : shared the log with code.

  


  ffmpeg -loglevel debug -hide_banner -re -i sample1.mp3 -filter_complex asplit=2 -c:a mp3 -listen 1 -f mp3 http://127.0.0.1:4000 -c:a mp3 -listen 1 -f mp3 http://127.0.0.1:4010
Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-hide_banner' ... matched as option 'hide_banner' (do not show program banner) with argument '1'.
Reading option '-re' ... matched as option 're' (read input at native frame rate; equivalent to -readrate 1) with argument '1'.
Reading option '-i' ... matched as input url with argument 'sample1.mp3'.
Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument 'asplit=2'.
Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'mp3'.
Reading option '-listen' ... matched as AVOption 'listen' with argument '1'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'mp3'.
Reading option 'http://127.0.0.1:4000' ... matched as output url.
Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'mp3'.
Reading option '-listen' ... matched as AVOption 'listen' with argument '1'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'mp3'.
Reading option 'http://127.0.0.1:4010' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Applying option hide_banner (do not show program banner) with argument 1.
Applying option filter_complex (create a complex filtergraph) with argument asplit=2.
Successfully parsed a group of options.
Parsing a group of options: input url sample1.mp3.
Applying option re (read input at native frame rate; equivalent to -readrate 1) with argument 1.
Successfully parsed a group of options.
Opening an input file: sample1.mp3.
[NULL @ 00000216ab345b80] Opening 'sample1.mp3' for reading
[file @ 00000216ab346180] Setting default whitelist 'file,crypto,data'
[mp3 @ 00000216ab345b80] Format mp3 probed with size=4096 and score=51
id3v2 ver:4 flags:00 len:134
[mp3 @ 00000216ab345b80] pad 576 576
[mp3 @ 00000216ab345b80] Skipping 0 bytes of junk at 561.
[mp3 @ 00000216ab345b80] Before avformat_find_stream_info() pos: 561 bytes read:32768 seeks:0 nb_streams:1
[mp3 @ 00000216ab345b80] demuxer injecting skip 1105 / discard 0
[mp3float @ 00000216ab34f3c0] skip 1105 / discard 0 samples due to side data
[mp3float @ 00000216ab34f3c0] skip 1105/1152 samples
[mp3 @ 00000216ab345b80] All info found
[mp3 @ 00000216ab345b80] After avformat_find_stream_info() pos: 22065 bytes read:32768 seeks:0 frames:50
Input #0, mp3, from 'sample1.mp3':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.45.100
  Duration: 00:12:58.48, start: 0.025057, bitrate: 128 kb/s
  Stream #0:0, 50, 1/14112000: Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.91
Successfully opened the file.
[Parsed_asplit_0 @ 00000216ab34fc80] Setting 'outputs' to value '2'
Parsing a group of options: output url http://127.0.0.1:4000.
Applying option c:a (codec name) with argument mp3.
Applying option f (force format) with argument mp3.
Successfully parsed a group of options.
Opening an output file: http://127.0.0.1:4000.
Matched encoder 'libmp3lame' for codec 'mp3'.
    Last message repeated 1 times
[http @ 00000216ab44d980] Setting default whitelist 'http,https,tls,rtp,tcp,udp,crypto,httpproxy,data'