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• timeshift Jumps in Live Streaming HLS Playback

  8 avril 2024, par matin

  some times in live streaming with hls (h264) client show a jump back in time shift
but index.m3u8 and playlist.m3u8 is ok and segments are correctly generated
I see this problem in our player and hls demo too
is there any thing related too transcoding and ffmpeg cause or prevent this problem

  


• FFMPEG concat leaves audio gapes between clips

  14 novembre 2022, par GotCubes

  I'm writing a python script that uses subprocess to invoke FFMPEG, not using pyffmpeg.

  



  My script generates a variable number of MP4 files using the AAC audio codec, and concatenates them together using FFMPEG. Here is how I'm constructing each clip :

  



  ffmpeg -loop 1 -i image.jpg -i recording.mp3 -tune stillimage -c:a aac -b:a 256k -shortest clip.mp4


  



  The command I'm using to concatenate them is :

  



  ffmpeg -f concat -i clip_names.txt -c copy video_raw.mp4


  



  I then take that resulting video, and mix a looping audio track over it, and adjust the volume. (Sorry for the awful formatting)

  



  ffmpeg -i video_raw -filter_complex
                 "amovie=Tracks/Breaktime.mp3:loop=0,
                  volume=0.1,
                  asetpts=N/SR/TB[aud];
                  [0:a][aud]amix[a]"
-map 0:v -map [a] -b:a 256k -shortest final_video.mp4


  



  These commands seem to work as I intend them to. When I play the resulting MP4 from my local machine, everything plays without issue.

  



  However, I uploaded the video to YouTube, and ran into issues. When the video is played from YouTube, there is about a second of silence at every timestamp where two clips were concatenated, before the next clip begins. I've tried this from Chrome, IE, and Firefox, all with the same issues.

  



  Based on what I've looked into so far, I think it could be an issue with how the priming samples of each individual clip are handled. I'm not obligated to keep using MP4 or AAC, so if using a different audio/video codec would work better, feel free to suggest !

  



  Is there some type of manipulation I can do in FFMPEG to get rid of the priming samples, or somehow process them differently ? In the end, I'm looking for each clip to play back to back without the delay that the concat operation seems to insert. Thank you !

  


• Want to convert WebM files to Mp4, AVI, MOV etc

  17 janvier 2015, par shilpi_agrawal

  I converted Mp4, AVI, MOV files to WebM using ffmpeg with good quality. Now I need my original files with same size and quality. Will it be possible to get it back ?