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• Convert m4a to wav, but respect edit list ffmpeg [closed]

  4 février 2024, par user3413723

  I'm using ffmpeg to convert a m4a file to wav. The problem it the m4a file has an edts list that makes the audio start after a bit. I need this to be included so the wav is silent for that time. The audio has to be synced correctly. Any ideas ? I tried these :

  


  ffmpeg -i short.m4a  -acodec pcm_s16le -ac 1 -ar 16000 -use_editlist 1 out.wav

ffmpeg -i short.m4a  -acodec pcm_s16le -ac 1 -ar 16000 -advanced_editlist 0 out.wav


  


  no luck with either. Any ideas ? Here is the file

  


  https://drive.google.com/file/d/10x3QFjT_67ByfgXtiNFE1RlLAcwG68e5/view?usp=sharing

  


  Here is the debugger where you can see it adds time at the beginning. Just upload the m4a file and you can see the info about the audio track. You can also see it if you do ffprobe file.m4a like this :  Duration: 00:00:14.84, start: 0.167007, bitrate: 228 kb/s

  


  mp4 inspector :
https://gpac.github.io/mp4box.js/test/filereader.html

  


• ffmpeg - add 2 seconds pause or silence after an audio clip [closed]

  29 janvier 2023, par Sudesh

  I've got the following audio clip and want to add 2 seconds of pause or silence after it, without compromising audio quality. I tried filter_complex with concat but it is decreasing quality.

  


  -filter_complex \"[0:0] [1:0] concat=n=2:v=0:a=1[out]\"


  


  Do I need to reencode the input audio file & silent file to the same sample rate and channel ?
I tried that too but it is still having quality issues.

  


  These are the clips
Audio Clip - https://d9f35555a8b3e9044c8d-95c21efaab8093d23d4124e599a618ee.ssl.cf5.rackcdn.com/065e8247-3df8-4880-b4c6-7c11a5a6d8fb.mp3

  


  Silence/Pause Clip - https://d9f35555a8b3e9044c8d-95c21efaab8093d23d4124e599a618ee.ssl.cf5.rackcdn.com/silence_2.0_sec_1.mp3

  


  Please help me to get the output without losing quality.

  


• How to overlay a png to piped video source with audio mixed in via ffmpeg ?

  5 janvier 2018, par Christopher Stevens

  I’m successfully streaming silent video with music added from my Raspberry Pi (Raspbian) to YouTube via ffmpeg, with the help of this GitHub gist and this post :

  raspivid -o - -t 0 -vf -hf -w 1280 -h 720 -fps 25 -b 4000000 | \
  
  ffmpeg -i music.wav \
  
  -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental \
  
  -f flv rtmp://a.rtmp.youtube.com/live2/STREAMKEY

  The last step of my project to add a transparent, full width/height png overlay to the video (1280x720 size in my case). I’ve seen a few related answers such as this one and this one.

  With the added complexity of piping in a camera feed, mixing in an audio source and outputting to a video stream, I haven’t succeeded in adding the image overlay. Where/how would I add a transparent image overlay in the example above ?