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, [email protected] 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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