Exoplayer can't play mpegts streams transmitted by ffmpeg properly ... demuxing problem?

Version

Media3 release branch

More version details

1.5.1

Also tested 1.6.-alpha01 and main (@25Jan25)

Devices that reproduce the issue

• RK3399 running Android 10
• Samsung Galaxy S23+ running Android 14

Devices that do not reproduce the issue

Nil

Reproducible in the demo app?

Yes

Reproduction steps

(Reproduced in own application but also in Demo app with a few extra lines of code added to allow a UdpDataSource and specify TsExtractorFlags);

Transmit an mp4 file (I used bigbunny) across nw as follows:

ffmpeg -re -stream_loop -1 -i c:/temp/bb_1080p60.mp4 -c:v copy -c:a copy -f mpegts -flush_packets 0 "udp://239.100.0.3:1234?pkt_size=1316"

(used both ffmpeg 6.1 and 7.1)

Play the stream in app using media uri of udp://239.100.0.3:1234

Expected result

Video should play smoothly. Audio should play smoothly.

Actual result

Video stops and starts with long pauses. Audio likewise, and the times when audio plays does not coincide when the video plays either. All indications are it's not demuxing the video reliably from the packet stream.

However, if you stream out the file using VLC instead of ffmpeg (selecting transport udp with no transcode) it works fine. Have been unable to determine what's different between the two streams - ffprobe reports same info on each. ffplay works fine too.

No errors logged in logcat during the pauses.

Media

Problem is really not media specific, but use this file:

https://download.blender.org/demo/movies/BBB/bbb_sunflower_1080p_60fps_normal.mp4.zip

Bug Report

• You will email the zip file produced by adb bugreport to android-media-github@google.com after filing this issue.