[FFmpeg-devel] [PATCH] lavfi/buffersrc: push the frame deeper if requested.

Marton Balint cus at passwd.hu
Sun Jul 9 22:07:35 EEST 2017

On Sun, 9 Jul 2017, Paul B Mahol wrote:

> On 7/9/17, Marton Balint <cus at passwd.hu> wrote:
>> On Sat, 24 Jun 2017, Nicolas George wrote:
>>> Le sextidi 6 messidor, an CCXXV, Paul B Mahol a ecrit :
>>>> The reverted commit breaks lot of filters and I failed to find fix,
>>>> the only logical solution
>>> It breaks a corner-case option of, indeed a lot of, filters. I have not
>>> yet been able to track down the exact cause of the problem, I still have
>>> all this in my work tree.
>> The revert itself broke a rather simple buffersrc->buffersink case as
>> well:
>> ffmpeg -f lavfi -i "testsrc[out0];sine[out1]" -bsf:a noise=dropamount=1
>> out.avi
>> ffmpeg is now consuming all memory, it seems video frames are stuck in the
>> filter graph forever.
>> (the dropamount parameter to the noise bitstream filter was just committed
>> to be able to drop all packets of a stream)
> I believe you are referring to another commit which also needs to be reverted.

No, definitely this one (04aa09c4bcf2d5a634a35da3a3ae3fc1abe30ef8). The 
input frames are arriving just fine, so ffmpeg can initialize the 
filtergraph, but only one video frame comes out of the filtergraph, the 
others are stuck there forever.


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