[Libav-user] ffmpeg @ 2.0.X has a bogus FFV1 codec?

[André Anjos]

Another question:

>From my investigations, the program aborts at a failed attempt to encode a
new frame (using avcodec_encode_video2()). If the problem is on the
initialisation, how can I check the codec is ready before attempting an
encode?

Thanks, André


On Tue, Oct 22, 2013 at 2:49 PM, André Anjos <andre.dos.anjos at gmail.com>wrote:

> Thanks for this reply. Could you please share a fix for the program that
> makes it work?
>
> André
>
>
> On Tue, Oct 22, 2013 at 10:29 AM, Paul B Mahol <onemda at gmail.com> wrote:
>
>> On 10/22/13, Andre Anjos <andre.dos.anjos at gmail.com> wrote:
>> > Hello,
>> >
>> > I'm using a MacPorts build of ffmpeg 2.0.2. It passes most of our tests,
>> > except the one using the FFV1 codec. This seems independent of the file
>> > format chosen.
>> >
>> > How to reproduce the problem:
>> >
>> > 1) Download the muxing example from the ffmpeg doxygen documentation (
>> > http://ffmpeg.org/doxygen/2.0/doc_2examples_2muxing_8c-example.html)
>> >
>> > 2) By the end of the application, replace the code:
>> >
>> > if (fmt->video_codec != AV_CODEC_ID_NONE) {
>> > video_st = add_stream(oc, &video_codec, fmt->video_codec);
>> > }
>> >
>> > With:
>> >
>> > video_st = add_stream(oc, &video_codec, AV_CODEC_ID_FFV1)
>> >
>> > So, that the FFV1 codec is forced.
>> >
>> > 3) Compile the program (on OSX, that would be):
>> >
>> > clang -I/opt/local/include test.c -L/opt/local/lib -lavutil
>> > -lavcodec -lavformat -lswscale -lswresample -o ffmpeg_test
>> >
>> > 4) Run the program:
>> >
>> > ./ffmpeg_test foo.avi
>> >
>> > to get:
>> >
>> > [libmp3lame @ 0x7fa7d201f200] Channel layout not specified
>> >  Output #0, avi, to 'test.avi':
>> >      Stream #0:0: Video: ffv1, yuv420p, 352x288, q=2-31, 400 kb/s, 90k
>> tbn,
>> >  25 tbc
>> >      Stream #0:1: Audio: mp3 (libmp3lame), 44100 Hz, 2 channels, fltp,
>> 64
>> >  kb/s
>> >  Error encoding video frame: Invalid argument
>> >
>> > Result: Bogus file, with error
>> >
>> > Expected result: clean file with no errors.
>> >
>> > Can anyone confirm this or provide some light on what I could possibly
>> be
>> > doing wrong? A developer from MacPorts has confirmed the problem - it
>> does
>> > not happen on 1.2.x. It does happen with 2.0.1 and 2.0.2 (
>> > https://trac.macports.org/ticket/40829).
>> >
>> > Thanks in advance, A
>>
>> FFmpeg 2.0.X does not have bogus FFV1 codec.
>>
>> The examples code is of very low quality.
>>
>> FFV1 encoder have been changed in its initialization to abort when
>> width/height is not set.
>> _______________________________________________
>> Libav-user mailing list
>> Libav-user at ffmpeg.org
>> http://ffmpeg.org/mailman/listinfo/libav-user
>>
>
>
>
> --
> André Anjos
> http://andreanjos.org
>



-- 
André Anjos
http://andreanjos.org
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