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• How do I concat two video mp4 files, each of which has an audio of different sample rates with ffmpeg

  14 août 2020, par Geo

  I have two videos : video1.mp4 and video2.mp4 in the configured txt file, both videos have mp3 audios :
video1.mp4 has : Audio : mp3, 32000 Hz, mono, fltp, 48 kb/s
video2.mp4 has : Audio : mp3, 24000 Hz, mono, fltp, 32 kb/s
I need to keep the different sample rates since I need to change the pitch to make it sound different from the real voice of the person, now I tried to merge the two videos by concatenating them :

  


  ffmpeg -safe 0 -f concat -segment_time_metadata 1 -i videoconf.txt -vf select=concatdec_select -af aselect=concatdec_select,aresample=async=1 -y videoout.mp4

  


  but I got a lot of errors like these :

  


  [aac @ 0x730e491e00] channel element 2.12 is not allocated

  


  index.js:81 Error while decoding stream #0:1 : Invalid data found when processing input

  


  index.js:81 [aac @ 0x730e491e00] TYPE_FIL : Input buffer exhausted before END element found

  


  index.js:81 Error while decoding stream #0:1 : Invalid data found when processing input

  


  ......

  


  So how can I concatenate multiple videos with different audio sample rates inside each video ?
By the way, when the sample rates are the same for all the audios inside each video, the concat works like a charm.

  


  Thanks

  


• lavf/movenc : allow writing avc3 sample entry type

  15 novembre 2017, par John Stebbins

  lavf/movenc : allow writing avc3 sample entry type
  The avc3 sample entry type is useful for adaptive streaming.  It permits
  
  parameter sets to be written inline in the video stream.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/movenc.c

• Download multiple files with ffmpeg, keep one stream from each (according to default stream selection), and then mux them into single file ?

  23 août 2021, par Bernard

  With ffmpeg, I can download m3u8 streams with the following command :

  


  ffmpeg -i http://example.com/test.m3u8 -c copy output.mp4


  


  The above command will keep the best quality video and audio (to some definition of 'best').

  


  However, I'm faced with a situation where I have several m3u8 streams, all of them possibly containing zero or more video or audio streams. I would like to take at most one video and audio from each url (according to ffmpeg's definition of 'best'), and mux them together into the final mp4 file.

  


  This is essentially what I want :

  


  ffmpeg -i http://example.com/test0.m3u8 -c copy output0.mp4
ffmpeg -i http://example.com/test1.m3u8 -c copy output1.mp4
ffmpeg -i http://example.com/test2.m3u8 -c copy output2.mp4
ffmpeg -i output0.mp4 -i output1.mp4 -i output2.mp4 -map 0 -map 1 -map 2 -c copy output.mp4


  


  Is there any way to do it without the temporary files ?