From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?UTF-8?Q?Cl=C3=A9ment?= Lassieur <clement@lassieur.org>
Subject: bug#31356: Some videos don't work with recent Icecat
Date: Thu, 03 May 2018 16:48:44 +0200
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To: 31356@debbugs.gnu.org

Clément Lassieur <clement@lassieur.org> writes:

> Hi,
>
> Recent Icecat can't play some videos, like this one:
>
> https://www.radioradicale.it/scheda/540252/operazione-black-job-illustrazione-dei-dettagli-del-blitz-contro-la-corruzione
> (thank you catonano for the link and for reporting it on IRC).
>
> Whereas an older one (say,
> /gnu/store/s85ykg7ggz8vlc0rf7ccjyz1af9n1q73-icecat-52.3.0-gnu1/bin/icecat)
> can play them.
>
> It should be bisectable.
>
> Cheers,
> Clément

Here are more details, thanks to Marius on IRC:

Quoth Web Console (Ctrl+Shift+K):
    The video on this page can’t be played. Your system may not have the
    required video codecs for: video/mp4, video/mp4; codecs="avc1.42E01E
    mp4a.40.2"

html5test.com:
    bad (/gnu/store/kkrpnjsi83f7a660zy8yhpi4b87jf1h3-icecat-52.6.0-gnu1/bin/icecat):
    http://html5test.com/s/dae49b3d3f6f4652.html

    good (/gnu/store/s85ykg7ggz8vlc0rf7ccjyz1af9n1q73-icecat-52.3.0-gnu1/bin/icecat):
    http://html5test.com/s/95cbda3d3f712ff3.html

And indeed, H.264 is missing.