6.0.0 video thumbnailer...

[Gilles Caulier]

Else, i tested with the collection of video files from GDrive :

https://drive.google.com/drive/folders/10-SJNtJZZQd_LIchfav-YQ9a-pNsQStT

The thumbnailer work as expected and there is no problem as QtAv frame
extractor generate.

Note : the thumbnails orientation don't need to be changed. Sound like
ffmpeg autorotate the stream automatically. There are few video taken
vertically in the collection and without to use exif rotation flag value,
all is displayed in right direction as well.

Note2 : The video preview is also auto-rotated by QtAv widget. No need to
double rotation of video while playing. Just test with video sample to
reproduce the problem.

Gilles Caulier

2018-03-08 15:51 GMT+01:00 Gilles Caulier <caulier.gilles at gmail.com>:

> Maik,
>
> The new video thumbnailer code based on ffmpeg is reviewed and optimized,
> excepted the last deprecated warning messages.
>
> These last one are relevant of change of FFMPEG API. It's not only some
> method call changes (+arguments). The type of structures have also changed.
> Typically :
>
> - AVPicture struct must be changed as AVFrame or a utils method from
> libavutil must be used.
>
> - AVCodecContext struct must be changed as AVCodecParameters.
>
> This must be done before to change deprecated methods. A simple migration
> of deprecated methods introduce more warnings due to use other internal
> structures.
>
> The most tedious method to port is avcodec_decode_video2() which must e
> replaced by 2 calls :  avcodec_send_packet() and avcodec_receive_frame().
> The last one must be pooled with a loop. It's not simple...
>
> Gilles
>
>
>
>
> 2018-03-06 22:06 GMT+01:00 Gilles Caulier <caulier.gilles at gmail.com>:
>
>> No, i use last stable QtAv 1.12.0 from Mageia6...
>>
>> Gilles
>>
>> 2018-03-06 21:20 GMT+01:00 Maik Qualmann <metzpinguin at gmail.com>:
>>
>>> Gilles,
>>>
>>> do you use QtAV from the git/master? If so, it may be due to a new
>>> signal in
>>> the video frame extractor compared to version 1.12. I could fix that.
>>>
>>> Maik
>>>
>>> Am Sonntag, 4. März 2018, 23:00:17 CET schrieb Gilles Caulier:
>>> > And this line :
>>> > https://cgit.kde.org/ffmpegthumbs.git/tree/CMakeLists.txt#n16
>>> >
>>> > Gilles
>>> >
>>> > 2018-03-04 22:58 GMT+01:00 Gilles Caulier <caulier.gilles at gmail.com>:
>>> > > Look this line :
>>> > >
>>> > > https://cgit.kde.org/ffmpegthumbs.git/tree/ffmpegthumbnailer.h#n21
>>> > >
>>> > > Gilles
>>> > >
>>> > > 2018-03-04 19:27 GMT+01:00 Maik Qualmann <metzpinguin at gmail.com>:
>>> > >> Gilles,
>>> > >>
>>> > >> libffmpegthumbnailer has no KIO dependencies, only C and FFMpeg. Or
>>> I do
>>> > >> not
>>> > >> look right? Does the package exist in your Linux distribution?
>>> > >>
>>> > >> https://github.com/dirkvdb/ffmpegthumbnailer/tree/master/lib
>>> > >> ffmpegthumbnailer
>>> > >>
>>> > >> Maik
>>> > >>
>>> > >> Am Sonntag, 4. März 2018, 18:56:48 CET schrieb Gilles Caulier:
>>> > >> > Another one : https://bugs.kde.org/show_bug.cgi?id=387892
>>> > >> >
>>> > >> > not reproducible here, but with FFMPEG, this will kill the bug...
>>> > >> >
>>> > >> > Gilles
>>> > >> >
>>> > >> > 2018-03-04 18:55 GMT+01:00 Gilles Caulier <
>>> caulier.gilles at gmail.com>:
>>> > >> > > For me this entry is valid :
>>> > >> > >
>>> > >> > > https://bugs.kde.org/show_bug.cgi?id=390443
>>> > >> > >
>>> > >> > > and we can try to close this file if we use FFMPEG directly to
>>> > >>
>>> > >> generate
>>> > >>
>>> > >> > > thumbnailer...
>>> > >> > >
>>> > >> > > Gilles
>>> > >> > >
>>> > >> > > 2018-03-04 17:49 GMT+01:00 Gilles Caulier <
>>> caulier.gilles at gmail.com>:
>>> > >> > >> Hi all,
>>> > >> > >>
>>> > >> > >> Since i written the FFMPEG video metadata parser in 6.0.0
>>> branch,
>>> > >> > >> i'm
>>> > >> > >> trying to register a huge video collection from my host
>>> computer.
>>> > >> > >>
>>> > >> > >> Here, more than 2500 MKV files are present, plus a lots of
>>> MP4, MOV,
>>> > >>
>>> > >> and
>>> > >>
>>> > >> > >> another media taken with cellular and camera.
>>> > >> > >>
>>> > >> > >> The registration have been very fast. 2500 file parsed in 2
>>> minutes
>>> > >>
>>> > >> and
>>> > >>
>>> > >> > >> ready to use. System has SSD, Sqlite, 8 cores, and 32Gb of
>>> RAM. No
>>> > >>
>>> > >> crash
>>> > >>
>>> > >> > >> all work fine... excepted... the video thumbnails.
>>> > >> > >>
>>> > >> > >> I facing random dysfunctions with video files. Sometime thumbs
>>> are
>>> > >>
>>> > >> there,
>>> > >>
>>> > >> > >> sometime not. Using F5 always give a different results until i
>>> try
>>> > >> > >> to
>>> > >> > >> insist and i can see the DB locked and revival...
>>> > >> > >>
>>> > >> > >> The video thumbnailer is based on QtAV frame extractor. My
>>> QtAV is
>>> > >>
>>> > >> last
>>> > >>
>>> > >> > >> stable 1.12.0. I suspect a bug somewhere in QtAV, as i can see
>>> > >> > >> thumbnailer
>>> > >> > >> code including a lots of mutex to prevent concurrency.
>>> > >> > >>
>>> > >> > >> This is typically abnormal. FFMPEG API is re-entrant as i
>>> checked
>>> > >>
>>> > >> with
>>> > >>
>>> > >> > >> the multi-threaded metadata parser unit test.
>>> > >> > >>
>>> > >> > >> As we depend now directly of FFMPEG API, I propose to rewrite
>>> the
>>> > >>
>>> > >> video
>>> > >>
>>> > >> > >> thumbnailer with libav C function.
>>> > >> > >>
>>> > >> > >> We have code ready to use with ffmpeg API here :
>>> > >> > >>
>>> > >> > >> https://cgit.kde.org/ffmpegthumbs.git/tree/
>>> > >> > >>
>>> > >> > >> Your viewpoint ?
>>> > >> > >>
>>> > >> > >> Gilles
>>>
>>>
>>>
>>>
>>>
>>
>
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