1298658 - Broken WebM VP9 video could not be decoded but Chrome can play

Status: REOPENED

(Core :: Audio/Video: Playback, defect, P3)

Description

[YF (Yang)]

STR:
Open http://vod1.dgxue.com/0001.%E7%94%B5%E8%B7%AF%E7%9A%84%E5%9F%BA%E6%9C%AC%E6%A6%82%E5%BF%B5.webm


Actual result:
It works in Chrome and PotPlayer.

Comment 1

[Loic]

It doesn't work in old versions of FF too.

Comment 2

[YF (Yang)]

Due to bug 951770, it plays fine in Fx28.

Comment 3

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

[MediaPlayback #1]: D/PlatformDecoderModule Agnostic decoder supports requested type
[MediaPlayback #2]: D/PlatformDecoderModule Initialising FFmpeg decoder.
[MediaPlayback #2]: D/PlatformDecoderModule FFmpeg init successful.
[MediaPlayback #2]: D/PlatformDecoderModule Agnostic decoder supports requested type
[MediaPDecoder #1]: D/PlatformDecoderModule Choosing FFmpeg pixel format for video decoding.
[MediaPDecoder #1]: D/PlatformDecoderModule Requesting pixel format YUV420P.
[MediaPDecoder #1]: D/PlatformDecoderModule DoDecodeFrame:decode_video: rv=71 decoded=0 (Input: pts(7000) dts(7000) Output: pts(-9223372036854775808) opaque(0) pkt_pts(-9223372036854775808) pkt_dts(-9223372036854775808))
[MediaPDecoder #1]: D/PlatformDecoderModule DoDecodeFrame:decode_video: rv=24 decoded=1 (Input: pts(118000) dts(118000) Output: pts(-9223372036854775808) opaque(-9223372036854775808) pkt_pts(7000) pkt_dts(7000))
[MediaPDecoder #1]: D/PlatformDecoderModule Got one frame output with pts=7000 dts=7000 duration=111000 opaque=-9223372036854775808
[MediaPDecoder #1]: D/PlatformDecoderModule DoDecodeFrame:decode_video: rv=26 decoded=0 (Input: pts(118000) dts(118000) Output: pts(-9223372036854775808) opaque(0) pkt_pts(-9223372036854775808) pkt_dts(-9223372036854775808))

Comment 4

[Loic]

(In reply to YF (Yang) from comment #2)
> Due to bug 951770, it plays fine in Fx28.

I tested FF 21/25/29/33, no playback.

Comment 5

[Jean-Yves Avenard [:jya]]

Invalid Opus header: CodecDelay and pre-skip do not match!: file mozilla-central/dom/media/platforms/agnostic/OpusDecoder.cpp, line 87

The decision was made to not play files that are incorrectly encoded. There was an early bug in ffmpeg generating those files.

You only need to re-run them through a recent ffmpeg to fix it.

Comment 6

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

Given that Chrome will play this file, we should either change Firefox or add telemetry to monitor this situation.

Comment 7

[Jean-Yves Avenard [:jya]]

Chrome is the only browser playing this file. Hardly web compatibility..

So are going to allow playing any files ffmpeg plays (and a broken file ffmpeg generated in the first place)?

Comment 8

[Jean-Yves Avenard [:jya]]

Should add that seeking in those files will be broken (seeking to the end will cause the opus decoder to fail) and A/V sync off

Comment 9

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

We can add telemetry to track if it is a problem in the real world.

Comment 10

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

If Chrome does a broken job of playing the video then I'm happy to say it isn't a compat issue and re-close the bug as invalid.

Comment 11

[YF (Yang)]

(In reply to Anthony Jones (:kentuckyfriedtakahe, :k17e) from comment #9)
> We can add telemetry to track if it is a problem in the real world.

A user report it to user forum, and then had to use Chrome to plays it.

The video on webpage: http://www.dgxue.com/vod/diangongxue/4648.html 
The forum post: https://www.firefox.net.cn/read-53661

Comment 12

[Jean-Yves Avenard [:jya]]

You could respond there that this video was generated by a very old and broken version of FFmpeg... 
I don't see how today you could create such file even if you wanted to...

it was only broken in a dev version of ffmpeg and was quickly fixed.

Comment 13

[Jonathan Watt [:jwatt]]

Mass bug change to replace various 'parity' whiteboard flags with the new canonical keywords. (See bug 1443764 comment 13.)

Comment 14

[YF (Yang)]

updated url.