Hi,
It's some days I'm trying to figure how to do transcoding in 3.1.x without
triggering warnings for AVStream::codec deprecation.
The ffmpeg examples and ffmpeg itself still use this deprecated field, I
have some code that compiles and run, without using AVStream::codec but it
doesn't work well (it seems that the output file is not compressed at
all...)
The problem is the stream creation stage:
this is how transcoding.c, ffmpeg and most online code do:
out_stream = avformat_new_stream(ofmt_ctx, NULL);
in_stream = ifmt_ctx->streams[i];
dec_ctx = in_stream->codec;
enc_ctx = out_stream->codec;
encoder = avcodec_find_encoder(CODEC_ID_H264);
[copy stuff from dec to enc and set the stuff you want to change]
avcodec_open2(enc_ctx, encoder, NULL);
this is how I think it should be now:
out_stream = avformat_new_stream(ofmt_ctx, NULL);
in_stream = ifmt_ctx->streams[i];
auto dec_par = in_stream->codecpar, enc_par = out_stream->codecpar;
encoder = avcodec_find_encoder(CODEC_ID_H264);
enc_ctx = avcodec_alloc_context3(encoder);
[copy some dec_par to ctx, set the other ctx parameters]
avcodec_open2(enc_ctx, encoder, NULL);
avcodec_parameters_from_context(enc_par, ctx);
Is this correct?
Do I have in some way to set the output stream codec to something?
What do I have to do for streams I simpy want to remux that with the old
api are resolved with:
avcodec_copy_context(ofmt_ctx->streams[i]->codec,
ifmt_ctx->streams[i]->codec);
?
--
*Bye,*
* Gabry*
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