Create thumbnails from MPEG-DASH stream

[Jan Živković]

Summary of the bug:
I'm trying to process video images with openCV using ffmpeg for capturing of streams and have found an issue with DASH streams. I have also found a working example of DASH stream for reference.

Working DASH stream: ​http://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/manifestBR.mpd
Not working DASH stream: ​https://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/manifestARD.mpd

How to reproduce:

1. Have ffmpeg, any version, reproduced with:

• latest nightly (N-94982-gea673a0edb) for windows
• 4.1.4 for windows
• 3.4.6-0ubuntu0.18.04.1 linux(ubuntu)

2. Run the provided ffmpeg command

   % ffmpeg -i https://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/manifestARD.mpd -vf fps=1/10 img%03d.jpg
   

3. ffmpeg starts displaying error messages

   [dash @ 000001520cc98640] No longer receiving stream_index 1
   [dash @ 000001520cc98640] No longer receiving stream_index 2
   [dash @ 000001520cc98640] No longer receiving stream_index 3
   [dash @ 000001520cc98640] No longer receiving stream_index 4
   [dash @ 000001520cc98640] No longer receiving stream_index 5
   [dash @ 000001520cc98640] No longer receiving stream_index 6
   [https @ 000001520d278340] HTTP error 404 Not Found bitrate=N/A speed=16.6x
   [dash @ 000001520cc98640] Failed to open fragment of playlist 0
   [https @ 000001520d277fc0] HTTP error 404 Not Found
   [dash @ 000001520cc98640] Failed to open fragment of playlist 0
   

Using command ffplay with the "not working stream", content plays just fine. There seems to be a problem only with capturing thumbnail images.

ffplay https://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/manifestARD.mpd

Using verbose logs I noticed that ffmpeg was trying to fetch parts of DASH stream not yet made/streamed ie. fetching stream from future. Because there is no content yet, 404 error is output.
If I try the url that returned 404 in chrome (10 sec later) I get the response with movie, but if I try it as soon as the error appears there is no content (404).

I have also attached the report file generated by ffmpeg on latest nightly version for windows.

[Jan Živković]

ffmpeg command report

[Carl Eugen Hoyos]

Sounds as if this needs -re.