[Libav-user] Transcoding with new API avcodec_receive_packet

[Shu Wang]

The error is to tell you to set the linesize of input frame/picture, which
value is 0 and should be at least 1920 on y plane.

btw, your repo link is 404...

On Wed, Nov 29, 2017 at 9:12 PM, Leandro Moreira <
leandro.ribeiro.moreira at gmail.com> wrote:

> Hello there,
>
> I'm trying to code a simple transcoder that replicates (almost the same
> behavior) as this command line:
>
> ffmpeg -i input.mp4 -c:v libx264 -x264-params keyint=60:min-keyint=60:no-scenecut=1
> -c:a copy output.mp4
>
> In order to implement this code I used two examples I found:
>
>    - https://ffmpeg.org/doxygen/trunk/transcoding_8c-example.html
>    - https://ffmpeg.org/doxygen/trunk/encode_video_8c-example.html
>
> When I try to run my transcoder it doesn't produce the output and also
> shows this logging message:
>
> [libx264 @ 0x7fd99e801200] Input picture width (1920) is greater than
> stride (0)
>
> Am I missing something?
>
> *The entire code, how to compile it and run it.*
>
> https://github.com/leandromoreira/ffmpeg-libav-
> tutorial/blob/transcoding/2_transcoding.c
> <https://github.com/leandromoreira/ffmpeg-libav-tutorial/blob/transcoding/2_transcoding.ccat>
>
> gcc -g -Wall -o transcoding -lavformat -lavcodec -lswscale -lz
> 2_transcoding.c \
>   && ./transcoding small_bunny_1080p_60fps.mp4 bunny_1s_gop.mp4
>
> *A summary of my code:*
>
> // a simple transcode context
> typedef struct TrancodeContext {
>   char *file_name;
>   AVFormatContext *format_context;
>
>   int audio_stream_index;
>   int video_stream_index;
>
>   AVStream *stream[2];
>   AVCodec *codec[2];
>   AVCodecContext *codec_context[2];
> } TranscodeContext;
>
> //I use two context
> TranscodeContext *decoder = malloc(sizeof(TranscodeContext));
> TranscodeContext *encoder = malloc(sizeof(TranscodeContext));
>
> prepare_input(decoder);
> prepare_output(decoder, encoder);
>
> // decoding
> while (av_read_frame(decoder->format_context, i_packet) >= 0) {
>     decode_packet();
>     encode_frame();
> }
>
>
>
>
> _______________________________________________
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> Libav-user at ffmpeg.org
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>
>


-- 
Shu. Wang @ Bestminr
http://halfelf.me
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