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• Is there any way in ffmpeg to cut a video with embedded subtitles and multiple audio tracks accordingly ? [closed]

  21 février 2024, par Harsh

  I have a video which had multiple audio tracks and embedded subtitles. I tried using ffmpeg to cut it, but I could not get the subtitles with it, nor the audio tracks. Here's the command I tried :

  


  ffmpeg -i input.mkv -ss 00:01:16 -to 00:02:46 -map "[0:0]:v" -map "[0:3]:a" -map "[0:4]:s" -c copy output.mkv 


  


  I tried using this command -

  


  ffprobe -v info input.mkv


  


  to collect information about the streams and substituted the streams, but for some reason it gave an error which read something along the lines of - Output with label 0:0 does not exist. Is there an alternative to achieve the result I wish ?

  


  Edit - I tried this command :

  


  ffmpeg -i input.mkv -ss 00:01:16 -to 00:02:46 -map 0 -c:a copy -c:s copy output.mkv


  


  It does the task BUT I have trouble seeing the video on my pc, it just shows a black screen (VLC) but on my mobile when I watch it using PLAYit, it works fine but I can't see the first 8 seconds for some reason. Anyways fix for this ?

  


• wowza + live + ffmpeg + hls player, how to create the playlist.m3u8 ?

  9 mai 2018, par Ziv Barber

  I’m trying to setup a wowza live test server and then I can play hls from my mobile app. It do work without any problem for vod. I can play it in my app. I can also see the .m3p8 file if I enter this uri in the browser.
  I tried to do the same in live mode (my goal is to test some streaming parameters for live streaming). I tried to use ffmpeg to create the live stream :

  ffmpeg -re -i "myInputTestVideo.mp4" -vcodec libx264 -vb 150000 -g 60 -vprofile baseline -level 2.1 -acodec aac -ab 64000 -ar 48000 -ac 2 -vbsf h264_mp4toannexb -strict experimental -f mpegts udp ://127.0.0.1:10000

  I created a "source file" and connected it to the "Incoming Streams".
  I can see in my application’s Monitoring / Network tab that it do getting the data from ffmpeg.

  My problem is how to get the playlist.m3p8 file so I can play it from inside my app (hls based) ?

  Again, for now I need a way to test playing with the streaming settings and in real live I’ll have a real live streaming source.

• FFmpeg Degrades Quality of Video

  31 mars 2015, par elliotsandbox

  I have been tasked with converting a batch of videos from MOV to MP4 for an application my company is building. We’re converting the videos because a short MOV file has an extremely large file size (well over five hundred megabytes), obviously not what we want for a mobile application. Now I tried directly converting MOV to MP4 however FFmpeg produces broken MP4 files. I overcame this by converting MOV to AVI then the AVI to MP4. Huzza ! It works, however the quality is slightly degraded.

  Here is the code I am executing to convert the videos, it’s in Lua.

  os.execute(("./ffmpeg/ffmpeg -i %s %s/%s.avi"):format(inputDir[video], finalDirectory, friendlyName))
  
  os.execute(("./ffmpeg/ffmpeg -i %s/%s.avi %s/%s.mp4"):format(finalDirectory, friendlyName, finalDirectory, friendlyName))
  
  os.execute(("rm -r %s/%s.avi"):format(finalDirectory, friendlyName))

  I’ve had a look around and see that I should look at codecs and stuff. However my mind comes to a complete blank when it comes to codecs. I am certain that all I need is an extra parameter and the videos will just be fine.

  Any help is greatly appreciated !