[Libav-user] muxer ignoring my PTS audio values

Michael R. Hines michael at hinespot.com
Thu Jan 3 17:24:11 CET 2013

Thanks for the reply.

So, then a more accurate observation is that it is not advised to split
or merge multimedia content
using "raw" containers - as they may or may not support timestamps
properly when the
media is multiplexed......

- Michael

On Thu, 2013-01-03 at 16:16 +0000, Carl Eugen Hoyos wrote:

> Michael R. Hines <michael at ...> writes:
> > the problem was that I was not using a *actual* 
> > container to encapsulate my audio/video streams.
> > For example, if you make a call like this, for example:
> > avformat_alloc_output_context2(&ctx->outAudioFormatCtx, NULL, "ac3", NULL)
> > or  avformat_alloc_output_context2(&ctx->outAudioFormatCtx, NULL, "h264", NULL)
> Please understand that both "ac3" and "h264" are "actual" 
> containers in the sense that they are defined by public 
> standards.
> You can test those containers with ffmpeg (the application):
> $ ffmpeg -i input -f ac3 out1
> $ ffmpeg -i input -f h264 out2
> (The second example needs a ffmpeg executable with x264 support.)
> Both output files should decode fine with FFmpeg (and out2 for 
> example with the H264 reference decoder).
> Both "ac3" and "h264" are of course raw containers, but that 
> does not make them less "actual" imo (especially given that 
> both are defined in "actual" codec standards).
> Please note that I suspect the h264 format does support 
> timestamps, FFmpeg support for these timestamps is 
> unfortunately limited, several tickets are open.
> I am not sure how timestamps for encoded audio would help, 
> afaik when decoding ac3 streams the decoding speed is 
> defined.
> Carl Eugen
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> Libav-user at ffmpeg.org
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