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[Bug 1041794] Recent update breaks some Youtube videos
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Tue, 30 May 2017 17:24:21 +0000
  • Message-id: <>

--- Comment #7 from Jan Engelhardt <jengelh@xxxxxxx> ---
Are you saying that this may be fixable in consumers of the library?

That is a reasonable assumption, yes. I know of at least three consumers
(namely, mplayer, mpv, and ffplay) which continue to do their job even with

I do not know much what the browsers are doing, but from what I do remember is
that they use dlopen -- and probably version checks and whatnot to alter their
behavior. Yes, some research by browser maintainers/developers would be needed

Something else that pops out between ffmpeg-3.1 and ffmpeg-3.3:

@@ -92,9 +92,9 @@ Codecs:
- ..V.LS h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
+ D.V.LS h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
(decoders: h264_cuvid )

In other words, 3.1 did not support H264 *at all*, and 3.3 supports
*passthrough of H264 to CUDA hardware*, so maybe the browser is attempting to
use that, and then fails due to the lack of NVIDIA hardware.
You could install LiveHTTPHeaders for Firefox/Seamonkey and watch the HTTP URLs
pass by to see if indeed it downloads the H264 chunk, compared to *only*
downloading the WebM/format 43 with ffmpeg-3.1.

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