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• ffplay got extra delay seconds than ffmpeg

  14 juillet 2017, par jiandingzhe

  I am working on low-latency video streaming. When I was making some tests, I noticed ffplay got much extra latency than ffmpeg, though they are the same software package.

  The video is encoded in H.264, size 320x240, 15fps. The stream is packed in FLV format, uploading and receiving are both done via RTMP. ffmpeg is called fairly simple :

  $ ffmpeg -i 'rtmp://my.path.to/my_rtmp_stream' -f sdl window_title

  And ffplay is also called in simple way :

  $ ffplay 'rtmp://my.path.to/my_rtmp_stream'

  The ffmpeg would starts to show the video instantly, and plays the video with minor latency (<0.5s) ; while ffplay would start the video in 5 seconds, and introduce a delay of 8 seconds.

  I further optimized the ffplay way, by minimizing probe size :

  $ ffplay -probesize 32 'rtmp://my.path.to/my_rtmp_stream'

  In this way, the startup goes quickly, but the delay is still 3 seconds.

  Why they behave so differently ?

• Run ffmpeg on all files of a folder [duplicate]

  11 janvier 2023, par user204415

  I have folder with many videos : ABOUT_00001.mp4, ABOUT_00002.mp4, ABOUT_00003.mp4, ...&#xA;I want to decompose those videos into frames, so for doing that, I execute : ffmpeg.exe -i ABOUT_00001.mp4 ABOUT_00001-%d.jpg&#xA;But I would like to take automatically all the videos in the folder and execute that command.&#xA;Something like :

  &#xA;

  ffmpeg.exe -i ABOUT_00001.mp4 ABOUT_00001-%d.jpg

  &#xA;

  ffmpeg.exe -i ABOUT_00002.mp4 ABOUT_00002-%d.jpg

  &#xA;

  ...

  &#xA;

  ffmpeg.exe -i ABOUT_0000X.mp4 ABOUT_0000X-%d.jpg

  &#xA;

  And so on. Does anyone know how can I do that ?&#xA;Thanks in advace

  &#xA;

• MP3 file become silent when time changed in Firefox with audio API

  14 décembre 2022, par Simon Trichereau

  I have some problem but I need to give you some context :

  &#xA;

  I have a production environment with large audio mp3 files. Everything is working perfectly but files are too heavy. I used ffmpeg to reduce their Bitrates from 320kbit/s to 190kbit/s to free space in my disk.

  &#xA;

  My script worked well and I saved almost 50% of space, but before to put it in production I wanted to test it on pre-production and there is some problem with Firefox...

  &#xA;

  When I play the audio everything is working good, if I listen to it normally everything is working BUT, when I click on the range to change the time and navigate into the audio, it becomes silent. Nothing happens, I can stop, start again, change the time, nothing works, but the audio is still playing...

  &#xA;

  I don't have any errors in my console, nothing so the only solution is to reload the page and play again the audio without changing the time.

  &#xA;

  I tried in chrome and it works like a charm, but in Firefox no. I also tried without any extensions and still the same...

  &#xA;

  Do you have any idea what is happening ?

  &#xA;

  Thanks a lot !

  &#xA;

  --- EDIT 14/12/2022 ---

  &#xA;

  Ok, I have tried a lot of different solutions and I finally found one, it seems firefox doesn't support VBR (variable bitrate) so I've compressed my file in CBR and it seems to finally work ...

  &#xA;