[FFmpeg-user] Problems getting the very last frames of videos using av_read_frame

[Peter Rennert]

I rebuild ffmpeg and cleared the issues with

WARNING: library configuration mismatch

(there was indeed libav installed because of a dependency..)

After rebuilding the wrapper, the issue is exactly the same.


On 30/10/14 13:48, Peter Rennert wrote:
> Hi Moritz,
>
> Thanks for looking into this.
>
> On 30/10/14 13:40, Moritz Barsnick wrote:
>> On Thu, Oct 30, 2014 at 12:15:34 +0000, Peter Rennert wrote:
>>
>>> except for the last frames. It seems as av_read_frame only reads until
>>> the last key frame and does not go beyond it.
>> Do you ever see "Unable to decode video picture: %d" from
>> https://bitbucket.org/groakat/ffvideo/src/b45143f755ac8da1e6ed4f52a11217af1e093d54/ffvideo/ffvideo.pyx?at=default#cl-233 
>>
>> ???
> No, I never saw that Error being raised.
>
>>
>> There's an example in ffmpeg's doc/ directory, named
>> demuxing_decoding.c, which uses your described av_read_frame() loop,
>> and succeeds at reading all 1000 frames.
> Thanks for that lead. I will follow that up and report the results later.
>
>>
>> So the issue is probably somewhere in the python wrapper.
>>
>>> ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
>>>     built on Apr  9 2014 16:32:16 with gcc 4.8 (Ubuntu/Linaro 
>>> 4.8.1-10ubuntu9)
>> This is quite a bit too old to gain support on this list. :)
> I will rebuild ffmpeg, and see if it persists.
>
>>
>>>     WARNING: library configuration mismatch
>> and is apparently using libraries from a different build, which is not
>> a good idea.
>>
>> The first suggestion would be to build lastest git, and ensure you're
>> not using "stale" libraries from older installs.
>>
>> (I don't have enough knowledge to tell you more about how to use libav
>> properly, I only know the examples. Anyway, there's a separate list for
>> libav issues: https://ffmpeg.org/mailman/listinfo/libav-user )
> To my knowledge I am not using libav. At least when I last checked ;).
>
>
>> Moritz
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>
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