There was no response to my question but I have found the culprit
on my own. I'll post it here for posterity. The playback problems
were all caused by wrong initialization order. A silly mistake.
I have originally opened the codecs before setting their flags:
av_dict_set(&voptions, "profile", "baseline", 0);
if (avcodec_open2(vctx, vcodec, &voptions) < 0) exit(7);
if (avcodec_open2(actx, acodec, 0) < 0) exit(8);
if (avio_open(&ctx->pb, filename, AVIO_FLAG_WRITE) < 0) exit(9);
outformat->video_codec = vcodec->id;
outformat->audio_codec = acodec->id;
if (ctx->oformat->flags & AVFMT_GLOBALHEADER) {
vctx->flags |= CODEC_FLAG_GLOBAL_HEADER;
actx->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
The correct order, however, is the following one:
outformat->video_codec = vcodec->id;
outformat->audio_codec = acodec->id;
if (ctx->oformat->flags & AVFMT_GLOBALHEADER) {
vctx->flags |= CODEC_FLAG_GLOBAL_HEADER;
actx->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
av_dict_set(&voptions, "profile", "baseline", 0);
if (avcodec_open2(vctx, vcodec, &voptions) < 0) exit(7);
if (avcodec_open2(actx, acodec, 0) < 0) exit(8);
if (avio_open(&ctx->pb, filename, AVIO_FLAG_WRITE) < 0) exit(9);
After this modification the playback problems have vanished.
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