[Libav-user] Converting ffmpeg cli command to libav c code

[drwho]

What I have done in the past is put print statements in the ffmpeg 
source code and recompile ffmpeg to figure out what is happening,

Jon

On 2024-12-06 15:54, martymoose21 at gmail.com wrote:
>
> To Whom it may concern,
>
> I’m trying to implement this cli command into c that calls the libav 
> API, however I am stuck as this is my first
> time using the libav libraries. I can’t get it to write the ‘covr’ tag 
> like the cli command does and I don’t
> really know where I’m going wrong. It seems to write the jpeg data but 
> not in a compliant format and therefore,
>
> only VLC can recognize the attached_pic.
>
> From what I understand here is what roughly needs to happen:
>
>  1. open the jpeg file using avformat_open_input
>  2. call avformat_find_stream_info with AVFormatContext param from step 1
>  3. create a new stream on the output AVFormatContext using
>     avformat_new_stream
>  4. call avcodec_parameters_copy with the jpeg context as the source
>     and the output as the destination
>  5. OR the created output stream’s ‘disposition’ member with
>     AV_DISPOSITION_ATTACHED_PIC (from what I understand the library
>     fills ‘attached_pic’ automatically?)
>  6. call avformat_write_header with the output AVFormatContext
>
> As I said previously, it’s my first time using the lib and I am unsure 
> if I missed a step or made an error executing the steps such as being 
> out of order and/or misinterpreting what needed to occur.
>
> Any help is greatly appreciated.
>
> ffmpeg -i file_audio.m4a -i file.jpg -map 0 -map 1 -c copy 
> -disposition:v:0 attached_pic file_audio_with_pic.m4a
>
>
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