[FFmpeg-devel] [PATCH] avcodec/libsvtav1: send the EOS signal without a one frame delay to allow for the library to operate in a low-delay mode

[James Almer]

On 2/27/2024 6:36 PM, Cosmin Stejerean via ffmpeg-devel wrote:
> 
> 
>> On Feb 27, 2024, at 1:19 PM, James Almer <jamrial at gmail.com> wrote:
>>
>> SVT-AV1 1.8.0 has this value set to 1.8.0, same as in the current git head commit. Is this in preparation for an upcoming release?
> 
> Yes, this is in preparation for release 2.0 which is targeted for next week. https://gitlab.com/AOMediaCodec/SVT-AV1/-/issues/2155 is tracking the status, and this API change is one of the outstanding items.

Without this patch, the command "ffmpeg -lavfi testsrc,format=yuv420p 
-vframes 101 -c:v libsvtav1 -loglevel debug -f null -" gives this:

> Output stream #0:0 (video): 101 frames encoded; 101 packets muxed (17890 bytes);
> Total: 101 packets (17890 bytes) muxed
> frame=  101 fps=0.0 q=31.0 Lsize=N/A time=00:00:04.00 bitrate=N/A

Whereas with it applied, i get:

> Output stream #0:0 (video): 101 frames encoded; 100 packets muxed (17885 bytes);
> Total: 100 packets (17885 bytes) muxed
> frame=  100 fps=0.0 q=35.0 Lsize=N/A time=00:00:03.96 bitrate=N/A

If i pass it a single frame, i get no output at all. So the last frame 
is being lost.