[Cin] AV1 yuv422p10le rendering with some output FFStream::seek I/O errors, seek fails

[Andrew Randrianasulu]

On Wed, Aug 7, 2024 at 9:13 PM Phyllis Smith via Cin
<cin at lists.cinelerra-gg.org> wrote:
>
> Summary is that the error message is due to lack of keyframes and the workaround is to use Transcode.
> BUT hopefully a better solution with the Render format parameters can be found.  The render fix for h264/h265 formats is the addition of the lines below (which obviously is not pertinent to av1).  I will see if I can find an alternative, but might not.

aomenc --help mentions

--kf-min-dist=<arg>         Minimum keyframe interval (frames)
--kf-max-dist=<arg>         Maximum keyframe interval (frames)

and there seems to be way (aom-params) to pass libaom specific options
via ffmpeg's ...

so ..
aom-params=kf-min-dist=25:kf-max-dist=25 ?

for svt-av1 you hopefully can use just keyint= with svtav1-params line?
command line svt av1 encoder seems to default for 5 seconds?

Also, may be add keyint_min=25 (for 25 fps vid) as generic libav*
(ffmpeg) option


>>
>> # use framerate for 1 keyframe/sec, needed for seeks
>> keyint_min=25                  (or keyint_min=30 for x265)
>> x264-params=keyint=25   (or x265-params-keyint=30 for x265)
>
>
> About the error message:
>>
>> FFStream::seek: /run/media/terje/Videoklipp/Cineform/av1_yuv422p10le_LP.webm
>>  retry limit, pos=207 tstmp=8280,   err: Input/output error
>> ** seek fail 207, 8280
>
>
> Seeking Issues (https://cinelerra-gg.org/download/CinelerraGG_Manual/Seeking_Issues.html)
>>
>> If you have an issue playing a video and not seeing it in the Compositor (just see a black
>> screen), it is most likely due to the media not being designed to be editable. It is most likely
>> not damaged. Generally it just does not have keyframes which are needed for seeking
>> which is what is done when you move around the media and start playing in the middle.
>> The media plays just fine in the compositor if you always play from the beginning because
>> then you don’t need keyframes to seek. You can get around this problem if you proxy the
>> media. A good choice to use for the proxy would be use scalar, ffmpeg/mp4 and size of 1/2.
>>
>> The proxied media can then seek and you will see it play in the compositor because keyframes exist.
>
> Or use TRANSCODE which adds keyframes when media is not seekable (see Manual for details). This is particularly useful for the mkv container, which often has seek problems.
>
> Just a reminder about the message below.
>>
>> FFMPEG::open_decoder: some stream times estimated:
>
> This is not a problem. Basically, when you open a file if a stream has a known duration, there is no message. If the duration is unknown, it is estimated by using the File Size and Bitrate to estimate the duration.
> ----------------------------------------
>
>> My AV1 (video only) test run procedure using CinGG loading a 10-bit input file, resulted in 12% smaller file size than with h265. Visually the AV1 output file seemingly is ok, but there are some CinGG output "FFStream::seek I/O errors, seek fails" I don't know what are  !?
>
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