>
> AVCodecContext.time_base is not used for decoding.
Thank you for your reply. I understand that time_base is not used during
decoding, but the transcoding code calls av_packet_rescale_ts twice, once
before decoding and once after encoding, as shown below:
540 if (filter_ctx[stream_index].filter_graph) {
541 StreamContext *stream = &stream_ctx[stream_index];
542
543 av_log(NULL, AV_LOG_DEBUG, "Going to reencode&filter the
frame\n");
544
545 av_packet_rescale_ts(packet,
546 ifmt_ctx->streams[stream_index]->time_base,
547 stream->dec_ctx->time_base);
548 ret = avcodec_send_packet(stream->dec_ctx, packet);
448 /* prepare packet for muxing */
449 enc_pkt->stream_index = stream_index;
450 av_packet_rescale_ts(enc_pkt,
451 stream->enc_ctx->time_base,
452 ofmt_ctx->streams[stream_index]->time_base);
453
454 av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n");
455 /* mux encoded frame */
456 ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt);
If dec_ctx->time_base and enc_ctx->time_base are not consistent, it can lead to
incorrect packet duration, which in turn causes issues with the output file's
duration.
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