On Thu, 13 Dec 2018, Carl Eugen Hoyos wrote:
2018-12-13 0:57 GMT+01:00, Hans Carlson <[email protected]>:
So, I'll rephrase Ulf's original question... how do you avoid this
warning while doing a stream COPY (remux)?
You cannot, as the maximum bit-rate cannot be set when remuxing. The
muxer has to assume that your input confirms to the relevant
specification. Note that command lines without "-f" make it impossible
for ffmpeg to even understand which standard you want.
So why did re-muxing work fine without any warnings before this change?
https://github.com/FFmpeg/FFmpeg/commit/079b5d4ef888bd42bf0147a6d964b8bc9ec0f3c5#diff-00823e6d5f4d3807869c905426e6bdd1
Prior to this change, the buffer size (along with other values) were
copied from the decoding context and used for the encoding context. This
was done in ffmpeg.c:transcode_init() in an if statement specifically for
stream_copy:
2903 enc_ctx->bit_rate = dec_ctx->bit_rate;
2904 enc_ctx->rc_max_rate = dec_ctx->rc_max_rate;
2905 enc_ctx->rc_buffer_size = dec_ctx->rc_buffer_size;
2906 enc_ctx->field_order = dec_ctx->field_order;
NOTE: Line numbers are based on rev: 079b5d4ef888bd42bf0147a6d964b8bc9ec0f3c5
Why is it now "impossible" to get that same information from the decoding
context?
Forgive my ignorance, but from my perspective, it USED to work and now it
doesn't work.
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