[FFmpeg-devel] [PATCH] avfilter: take_samples: do not directly return frame when samples are skipped

Muhammad Faiz mfcc64 at gmail.com
Sat May 20 13:43:07 EEST 2017

On Sat, May 20, 2017 at 4:56 PM, Nicolas George <george at nsup.org> wrote:
> Le decadi 30 floréal, an CCXXV, Muhammad Faiz a écrit :
>> Every patch that can fix the crash of
>> ffmpeg -i clip.wav -af alimiter -c:a mp3 -b:a 128k -ar 48k -f null -
>> can claim that it fixes ticket 6349.
>> Other cases should be in separate tickets.
> No, you are confusing the bug with its symptom. Chewing carefully does
> not CURE a dental cavity, it only works around it. The correct cure is
> to go to the dentist.
> This is the same here: you are working around the bug, but not fixing
> it. The correct fix is there:
> https://patchwork.ffmpeg.org/patch/3694/
> The project having become such an inhospitable place, I will no longer
> be working on it, but please feel free to take it over, pushing it as is
> or reworking it. Anyway, I will be rejecting any patch that pretends to
> "fix" this ticket with changes in lavfi.


>> IMHO, the solution is to document it properly to not mix
>> ff_inlink_consume_samples with ff_inlink_consume_frame, similar to
>> av_buffersink_get_frame vs av_buffersink_get_samples.
> As I said, I do not like the idea of limiting the API if it is not
> absolutely necessary. And I think it is not. What about this:
> If samples_skipped is set, then ff_inlink_consume_frame() can call
> ff_inlink_consume_samples() with the exact number of samples to force it
> to realign the frame at this point. (Of course, it requires disabling
> the case that does the opposite.)


> Would you look carefully at the code and tell me I did not miss
> something that would make it harder than it looks.
> If not, if you confirm it looks feasible, then I think this patch can go
> in almost as is: we do not need to actually implement it before it is
> required, that would be a waste of time, just add a comment near the
> assert to tell it is the plan. (And of course, remove "fix" from the
> commit message.)
> Now, I am not entirely sure that I understand correctly how this patch
> takes into account the number of samples skipped. I would like to look
> at it more carefully, but as you can see, Paul is rushing me.
> Regards,
> --
>   Nicolas George
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