Wrong frame rate in output MPD with TS input

[joeyparrish]

System info

Operating System: gLinux / Debian testing
Shaka Packager Version: v2.3.0-5bf8ad5-release

Issue and steps to reproduce the problem

Packager Command:

wget https://storage.googleapis.com/shaka-streamer-assets/test-assets/Sintel.2010.720p.Small.mkv

# Transcode into a TS container.
ffmpeg \
  -y -loglevel error \
  -to 0:01 -i Sintel.2010.720p.Small.mkv \
  -an -c:v h264 -b:v 3M intermediate.ts

# Package that TS into MP4 in DASH.
packager \
  'in=intermediate.ts,stream=video,output=from_ts.mp4' \
  --mpd_output from_ts.mpd

# Transcode into an MP4 container.
ffmpeg \
  -y \
  -to 0:01 -i Sintel.2010.720p.Small.mkv \
  -an -c:v h264 -b:v 3M intermediate.mp4

# Package that MP4 into MP4 in DASH, in a different manifest file from before.
packager \
  'in=intermediate.mp4,stream=video,output=from_mp4.mp4' \
  --mpd_output from_mp4.mpd

What is the expected result?

I would expect the frame rate in the MPD to be correct in both cases.

What happens instead?

The frame rate of the input file is 24 fps according to ffprobe. The frame rate of both intermediate.ts and intermediate.mp4 are 24 fps according to ffprobe. After packaging, the frame rate of both from_mp4.mp4 and from_ts.mp4 are 24 fps.

In from_mp4.mpd, the frameRate attribute is 12288/512, or 24 fps.

In from_ts.mpd, the frameRate attribute is 90000/7500, or 12 fps.

Something seems to go wrong when the intermediate file is TS instead of MP4.

If you run the same test with a different source file (https://storage.googleapis.com/shaka-streamer-assets/sample-inputs/Sintel.2010.720p.mkv), Packager does the right thing. It's not clear why that would be.

[kqyang]

@joeyparrish Thanks for the report. Will take a look.

[kqyang]

I assume this is caused by the same problem as #751. Mark it as a duplicate.