[FFmpeg-devel] [PATCH] avformat/dashenc: Disable writing CODECS tag for HEVC streams

[Jeyapal, Karthick]

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.
Hi Hendrik,

Please let me know if I can proceed with the push. I am relatively new to this ffmpeg forum and hence not sure how to proceed further for such comments.
I don't see it as a strong veto from you, but I just wanted to confirm before the push.

At least for time being this patch will enable people to use HEVC, while we add support the HEVC CODECS tags later.

Regards,
Karthick
>>
>> - Hendrik
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