[Libav-user] Encoders not working (Even using transcoding.c example)

[Paul B Mahol]

On 9/7/16, M N <assemblerx86 at yandex.com> wrote:
> Hi,
>
>  I have been getting errors regarding encoders such as: "Tag avc1/
> incompatible with output codec id '28'" while trying to encode anything, I
> also get errors such as "Invalid data detected in input" while trying to use
> avformat_write_header(). I am using latest FFMPEG Dev and Shared. And YES, I
> have tried many other videos.
>
>  So I have tried compiling "transcoding.c" ffmpeg example, and I could
> compile it, but when I tested it, I get this error:
>
> *************************************************************
>>testffc vid.mp4 vid3.mp4
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid.mp4':
>   Metadata:
>     major_brand     : mp42
>     minor_version   : 0
>     compatible_brands: isommp42
>     creation_time   : 2012-11-25T22:19:36.000000Z
>   Duration: 00:03:51.80, start: 0.000000, bitrate: 1023 kb/s
>     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
> 1280x720,
>  829 kb/s, 10 fps, 10 tbr, 20 tbn, 20 tbc (default)
>     Metadata:
>       creation_time   : 1970-01-01T00:00:00.000000Z
>       handler_name    : VideoHandler
>     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo,
> flt
> p, 191 kb/s (default)
>     Metadata:
>       creation_time   : 2012-11-25T22:19:36.000000Z
>       handler_name    : IsoMedia File Produced by Google, 5-11-2011
> [libx264 @ 01e7a540] broken ffmpeg default settings detected
> [libx264 @ 01e7a540] use an encoding preset (e.g. -vpre medium)
> [libx264 @ 01e7a540] preset usage: -vpre <speed> -vpre <profile>
> [libx264 @ 01e7a540] speed presets are listed in x264 --help
> [libx264 @ 01e7a540] profile is optional; x264 defaults to high
> Cannot open video encoder for stream #0
> Error occurred: Generic error in an external library
> *************************************************************
>
> Is it a bug in FFMPEG?? I couldn't get anything to work so far...

transcoding.c is example not 100% final product.

Read messages carefully and set encoder options as advised.