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• FFMpeg HLS to MXF video codec copy non monotonically increasing dts issue

  22 juin 2023, par arlovande

  I am rewrapping an HLS stream as an mxf file. The HLS is 1080p59.94 10bit 4:2:2. The mxf is a video codec copy and an audio conversion to pcm. The stream has video timecode burn-in for me to watch the video frames. Here is the command

  


  ffmpeg -i "https://myinput/index.m3u8" -f segment -timecode "01:01:01:00" -segment_time 600 -reset_timestamps 1 -c:v copy output_%03d.mxf


  


  I get the following non-fatal error

  


  "Application provided invalid, non monotonically increasing dts to muxer in stream 1"


  


  The file is still created, however. In VLC the file plays correctly frame by frame. But in Adobe premiere when I play frame by frame I get video stuttering and I see the timecode burn in plays in a sequence like this... 3 frames ahead, then 2 frames back... so the frame sequence would be something like ;03 ;01 ;02 ;06 ;04 ;05 ;09 ;07 ;08

  


  It's almost like Premiere does not know how to order the frames back together but VLC does. Any thoughts on how I might change the command to reorder the dts monotonically ?

  


  When I wrap to a .ts file I don't get this issue in Premiere, but I need MXF because Premiere can play an MXF file as a growing file.

  


• How to extract audio tracks from a stream using FFMPEG or other tools ?

  17 septembre 2023, par Vassili Bagrov

  Here is the stream link that I am trying to download.

  


  I can download the video, but for some reason it doesn't include the audio stream.

  


  The audio stream is also in .ts format and has 1569 chunks.

  


  When I downloaded all the audio files, I tried to convert them in single temp.ts file to them convert it into an mp3 file with this command :

  


  cat audio_7e42e066-9f6c-44f4-9ac8-10b50c3edfae_*.ts > temp.ts


  


  I tried to then convert it into an mp3 file with this command :

  


  ffmpeg -i temp.ts -acodec copy out.mp3


  


  But got an error :

  


  temp.ts: Invalid data found when processing input


  


  What are my options to download audio files ? There are actually 3 audio tracks if I watch the video from the website.
Please tell me there is a way to do it other than screen record the whole video.

  


• Multiple subtitle tracks on iOS with AVPlayer [closed]

  23 novembre 2024, par Martin Paucot

  I have a bunch of videos that are hosted on Vimeo. To allow users watching them on the mobile apps (Android & iOS) we use the m3u8 format given directly by Vimeo.

  


  It works great with expo-video as all our videos have transcript for different languages.

  


  I would like to allow the users to download videos so they can be watched offline. To achieve that I use ffmpeg to convert the .mp4 to .mkv and combine the .srt files.

  


  This solution works great on android, users can download videos and watch them offline with the ability to select subtitles. Unfortunately it seems that the AVPlayer on iOS (used by expo-video) does not support MKV. I tried different formats mov, mp4 containers, m4v where subtitles show properly on VLC after conversion but not on the iOS player. (either no subtitles at all, or only the first track).

  


  Is there a file format supported by AVPlayer that allows multiple subtitle tracks ?