[FFmpeg-devel] More than one HTTP inputs block

[Subrata Sa]

I need to fetch mp4 file from remote HTTP server and send its audio
and video to two separate RTP destinations. Has anyone done this? See
below for problem details.

On 7/16/07, Subrata Sa <kiteflyer77 at gmail.com> wrote:
> Hi,
>
> I'm trying to fetch mp4 file from HTTP server and send its audio and
> video to separate RTP destinations as given below:
>
> Input #0 from http://srcurl/sample.mp4
>  Stream #0.0: Video: vcodec1
>  Stream #0.1: Audio: acodec1
>
> Input #1 from http://srcurl/sample.mp4 [same URL]
>  Stream #1.0: Video: vcodec1
>  Stream #1.1: Audio: acodec1
>
> Output #0, rtp, to 'rtp://dsturl:6970
>   Stream #0.0: Video: vcodec2
>
> Output #1, rtp, to 'rtp://dsturl:6980 [different port]
>   Stream #1.0: Audio: acodec2
> Stream mapping:
>   Stream #0.0 -> #0.0
>   Stream #1.1 -> #1.0
>
> For "-an" and "-vn" options handling, I'm using this patch:
> http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2007-April/027693.html.
> While similar thing works fine if the file source is disk, in the
> above case, ffmpeg blocks at reading HTTP Input #1 and then unblocks
> after a long time. Ethreal shows that TCP buffer at ffmpeg side gets
> full and it keeps on sending zero window size till it manages to help
> itself. Here is output of ffmpeg run:
>
> [subrata at kansabati mplayerhq]$ ./ffmpeg -re -f mp4 -i
> http://192.168.50.7/Video/gm.mp4 -vcodec mpeg4 -an -r 10 -b 38.8kb -s
> qcif -f rtp rtp://192.168.50.7:6970?localport=5004 -f mp4 -i
> http://192.168.50.7/Video/gm.mp4 -vn -acodec libamr_nb -ac 1 -ar 8000
> -ab 12.2kb -f rtp rtp://192.168.50.7:6980?localport=5014 2>&1 | tee
> ffmpeg_log.txt
> FFmpeg version SVN-r9453, Copyright (c) 2000-2007 Fabrice Bellard, et al.
>   configuration: --enable-pthreads --enable-libamr-nb --enable-gpl
> --enable-libfaad
>   libavutil version: 49.4.1
>   libavcodec version: 51.40.4
>   libavformat version: 51.12.1
>   built on Jul  6 2007 17:17:03, gcc: 3.4.4 20050721 (Red Hat 3.4.4-2)
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'http://192.168.50.7/Video/gm.mp4':
>   Duration: 00:00:17.4, start: 0.000000, bitrate: 85 kb/s
>   Stream #0.0(und): Video: mpeg4, yuv420p, 160x120, 25.00 fps(r)
>   Stream #0.1(und): Audio: libamr_nb, 8000 Hz, mono
> [blocks here. <CTRL-C>]
> [subrata at kansabati mplayerhq]$
>
> I added function entry/ exit logs (av_log) to functions in
> libavformat/*.c files to see the function call stack. Here is the log
> at the end showing TCP read blocking:
> Above mentioned ffmpeg run with -v 100 param:
> ...
> entering aviobuf.c:url_ftell
> entering aviobuf.c:url_fseek
> exiting 2 aviobuf.c:url_fseek
> exiting aviobuf.c:url_ftell
> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8323c00]ISO: File Type Major Brand: isom
> entering aviobuf.c:url_fskip
> entering aviobuf.c:url_fseek
> exiting 4 aviobuf.c:url_fseek
> exiting aviobuf.c:url_fskip
> entering aviobuf.c:url_ftell
> entering aviobuf.c:url_fseek
> exiting 2 aviobuf.c:url_fseek
> exiting aviobuf.c:url_ftell
> entering aviobuf.c:url_feof
> entering aviobuf.c:url_fskip
> entering aviobuf.c:url_fseek
> exiting 2 aviobuf.c:url_fseek
> exiting aviobuf.c:url_fskip
> entering aviobuf.c:url_feof
> entering aviobuf.c:url_ftell
> entering aviobuf.c:url_fseek
> exiting 2 aviobuf.c:url_fseek
> exiting aviobuf.c:url_ftell
> entering aviobuf.c:url_fskip
> entering aviobuf.c:url_fseek
> entering aviobuf.c:url_seek_packet
> entering avio.c:url_seek
> entering http.c:http_seek
> entering http.c:http_open_cnx
> entering avio.c:url_open
> entering tcp.c:tcp_open
> exiting tcp.c:tcp_open
> exiting 2 avio.c:url_open
> entering http.c:http_connect
> entering avio.c:url_write
> entering tcp.c:tcp_write
> exiting tcp.c:tcp_write
> exiting avio.c:url_write
> entering avio.c:url_read
> entering tcp.c:tcp_read
>
> ---
> Sorry for the long explanation. Am I missing something here? Any hint
> is welcome.
>
> Regards,
> Subrata Sa
>