[FFmpeg-devel] [PATCH] Allow using only the mfra info for seeking using the fragment index

Derek Buitenhuis derek.buitenhuis at gmail.com
Wed Oct 7 18:44:53 EEST 2020

On 04/10/2020 15:28, Derek Buitenhuis wrote:
> From: Justin Ruggles <justin.ruggles at gmail.com>
> The mfra has enough information to enable seeking, and reading it is
> behind an AVOption flag, so we shouldn't require that sidx information
> also be present in order to seek using the fragment index.
> Signed-off-by: Derek Buitenhuis <derek.buitenhuis at gmail.com>
> ---
> This is especially important want I/O is networked, since otherwise it will
> read essentially the entire file by seeking to every sidx in the file, which
> for a live-style FMP4 can be a *lot*.
> Dale Curtis is CC'd, as this is probably highly relevant to him.
> Note: If a global sidx is present, that information will override the mfra, but
> if sidx are before each moof, those will no longer be parsed in mov_read_header
> if you set use_mfra_for, which can result in a wrong duration since mfra isn't
> used for setting duration while sidx is.
> ---
>  libavformat/mov.c | 1 +
>  1 file changed, 1 insertion(+)


- Derek

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