[FFmpeg-devel] [PATCH] avformat/dashenc: Disable writing CODECS tag for HEVC streams
kjeyapal at akamai.com
Fri Nov 2 03:59:44 EET 2018
On 10/21/18 4:45 PM, Jeyapal, Karthick wrote:
> On 10/21/18 2:28 PM, Hendrik Leppkes wrote:
>> On Sun, Oct 21, 2018 at 10:41 AM Karthick J <kjeyapal at akamai.com> wrote:
>>> For HEVC streams, only the FourCC tag is written without profile, level etc.,
>>> This is breaking playout support in native Safari.
>>> Native Safari playout expects the full info in CODECS tag or None at all.
>> Generating the full string shouldn't be that impossible for HEVC
>> either, why not go that more complete route?
> Two reasons:
> 1. I was not sure what is the right format of that string. I saw some examples, like hvc1.2.4.L123.B0. But I didn't know what that meant.
> If somebody here could provide some explanation or the relevant spec, I will hold off this patch and would definitely try implementing it.
> 2. I heard recently in a demuxed talk that for 2K and 4K resolution Apple clients don't playout properly even when properly constructed CODEC tag is there(hvc1.2.4.L153).
> But they played properly without a CODEC tag. https://www.twitch.tv/videos/323919819 , Seek to 42:30 for the relevant info.
> For the above two reasons, I assumed it is going to be a time-consuming job. Hence, I decided to atleast restore the earlier status for HEVC, so that we don't break anything that was working properly earlier.
>> - Hendrik
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