[Libav-user] Dumping RTSP(H264) stream to container

[Leandro Raffo]

Well seems like the base_time of the input and output streams are 0. How
can this be? Anyway to fix it maybe knowing the fps?
Here is kinda my main loop (Inserted in the main loop from remuxing.c and
doing a avformat_network_init())


    while (1)
{
        AVStream *in_stream,
*out_stream;

        if (av_read_frame(ifmt_ctx, &pkt) <
0)

break;
        in_stream =
ifmt_ctx->streams[pkt.stream_index];
        out_stream =
ofmt_ctx->streams[pkt.stream_index];


        log_packet(ifmt_ctx, &pkt,
"in");
        /* copy packet
*/
        pkt.dts =
video_dts;
        pkt.pts = ++video_dts;

        // Rescaling just gives 0 dts and 0 pts
        //av_rescale_q_rnd(++video_dts,  in_stream->time_base,
out_stream->time_base,
        //   AV_ROUND_PASS_MINMAX |
AV_ROUND_PASS_MINMAX);
        //ofmt_ctx->duration +=
pkt.duration;


        pkt.pos =
-1;

        log_packet(ofmt_ctx, &pkt, "out");

        if (av_interleaved_write_frame(ofmt_ctx, &pkt) < 0)
{
            fprintf(stderr, "Error muxing
packet\n");

break;

}


        av_packet_unref(&pkt);

        end = clock();
        if ( (100.f * (double)(end - begin) / CLOCKS_PER_SEC) > 10) {
            break;
        }



}



2016-08-29 13:09 GMT-03:00 Leandro Raffo <ljraffo at gmail.com>:

> Seems its just working with .avi as container and using mp4 just gives me
> like a half-second video for the same filesize. Also I didn't have a
> duration when watching the result over a video player, summing to the
> AVFormatContext->duration for the output stream's got me a duration when
> playing but I'm getting like 35 secs video for a 60 secs recording (It also
> looks kinda accelerated and it keeps just working for .avi).
>
> 2016-08-29 11:01 GMT-03:00 Leandro Raffo <ljraffo at gmail.com>:
>
>> I finally managed to make it work using the remuxing.c example by doing
>> an
>>
>> avformat_network_init()
>>
>> And incrementaly adding (from zero) one to pts and dts with pts + 1 = dts.
>>
>> I still don't understand why is this the case. "It Just Works" and I dont
>> like it. Can someone please enlighten me on this? Why don't I need to use
>> the in/out stream time_base?
>> Thanks in advance
>>
>> ---------- Forwarded message ----------
>> From: Leandro Raffo <ljraffo at gmail.com>
>> Date: 2016-08-24 10:25 GMT-03:00
>> Subject: Dumping RTSP(H264) stream to container
>> To: libav-user at ffmpeg.org
>>
>>
>> Hello,
>>
>> As the title say I'm trying to remux(I dont know if this is the correct
>> term) a rtsp h264 stream into a container(mp4). I've been fiddling with the
>> remuxing example given in the documentation for ffmpeg 3.1 (
>> https://www.ffmpeg.org/doxygen/3.1/remuxing_8c-example.html) with no
>> avail.
>> I know I can read the frames because I wrote them to disk (decode ->
>> encoded, not in h264 might i say so.). So I'm having troubles with the
>> writing them raw part (writing the frames without an decode/encode
>> pipeline).
>> I'm also a bit lost with the dts and pts in this part, how would this
>> work for an encoded stream?.
>>
>> These are the errors I'm getting when remuxing from two files
>>
>> [mp4 @ 0x1d869e0] Using AVStream.codec.time_base as a timebase hint to
>> the muxer is deprecated. Set AVStream.time_base instead.
>> [mp4 @ 0x1d869e0] Using AVStream.codec to pass codec parameters to muxers
>> is deprecated, use AVStream.codecpar instead.
>> [mp4 @ 0x1d869e0] Using AVStream.codec.time_base as a timebase hint to
>> the muxer is deprecated. Set AVStream.time_base instead.
>> [mp4 @ 0x1d869e0] Using AVStream.codec to pass codec parameters to muxers
>> is deprecated, use AVStream.codecpar instead.
>> [mp4 @ 0x1d869e0] track 1: codec frame size is not set
>> [mp4 @ 0x1d869e0] Timestamps are unset in a packet for stream 0. This is
>> deprecated and will stop working in the future. Fix your code to set the
>> timestamps properly
>>
>> And when remuxing from the rtsp stream
>>
>> [avi @ 0x18d1fe0] Using AVStream.codec.time_base as a timebase hint to
>> the muxer is deprecated. Set AVStream.time_base instead.
>> [avi @ 0x18d1fe0] Using AVStream.codec to pass codec parameters to muxers
>> is deprecated, use AVStream.codecpar instead.
>> [avi @ 0x18d1fe0] Application provided invalid, non monotonically
>> increasing dts to muxer in stream 0: 15 >= 6
>>
>>
>> Thanks in advance.
>>
>>
>
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