[Ffmpeg-devel] closed captioning bug?

[Cyrus A]

The audio seems broken now.

I upgraded the AMD 64 X2 system to FC4, downloaded the latest CVS, 
applied the v4l2 patch and ran a test.

The video looks nice, the captions are fine, but there is no sound. I 
can confirm with 100% certainty that sound on my system and audio device 
DOES work since trying the EXACT same ffmpeg command on a different 
build has sound. Plus, I noticed the same behavior when the patch was 
applied to CVS build of ffmpeg on an i386 FC5 machine I own as well.

Why do you think the audio is now broken?

Luca Abeni wrote:
> Hi,
>
> On Sun, 2006-04-23 at 12:05 -0400, Cyrus A wrote:
> [...]
>   
>> The vdelta hack didn't work. I tried -5, 5 and -15, 15. The first line 
>> read "if (vdelta < -1.1)" which is what I'm assuming you meant in your 
>> hack (you had it without the negative sign).
>>     
> Yes, sorry... I was away from my computer, and I had no way to check the
> source: I just had some old notes. Anyway, the "dirty hack" was
> something like this:
> diff -u -r1.379 ffmpeg.c
> --- ffmpeg.c    20 Apr 2006 12:57:19 -0000      1.379
> +++ ffmpeg.c    24 Apr 2006 06:31:38 -0000
> @@ -726,9 +726,9 @@
>          double vdelta;
>          vdelta = get_sync_ipts(ost) / av_q2d(enc->time_base) - ost->sync_opts;
>          //FIXME set to 0.5 after we fix some dts/pts bugs like in avidec.c
> -        if (vdelta < -1.1)
> +        if (vdelta < -10.0)
>              nb_frames = 0;
> -        else if (vdelta > 1.1)
> +        else if (vdelta > 10.0)
>              nb_frames = lrintf(vdelta);
>  //fprintf(stderr, "vdelta:%f, ost->sync_opts:%lld, ost->sync_ipts:%f nb_frames:%d\n", vdelta, ost->sync_opts, ost->sync_ipts, nb_frames);
>          if (nb_frames == 0){
>
> The values depend on the hw configuration. If this did not work, then
> the solution is v4l2.
>
>   
>> I'm not sure how to force ffmpeg to use v4l2. The configure output says 
>> nothing about it. Any help on how to force that change would be greatly 
>> appreciated.
>>     
> Try the attached "v4l2-fedora.diff" patch. After applying it, do
> make distclean; ./configure
> At this point, your config.h file should contain the line
> #define CONFIG_VIDEO4LINUX2 1
> If it does not, let me know and I'll try to understand why v4l2
> detection is not working on your system.
>
> If config.h is ok, recompile ffmpeg and try your usual command line...
> The ffmpeg output should indicate that video4linux2 is used. Hopefully,
> this will fix your problem. If it does not, I do not really know what to
> say... I never used the /dev/vbi device, and I only used PAL systems.
> We'll need some more debugging
>
> Anyway, let me know... 
>
> 			Thanks,
> 				Luca
>   
> ------------------------------------------------------------------------
>
> Index: configure
> ===================================================================
> RCS file: /cvsroot/ffmpeg/ffmpeg/configure,v
> retrieving revision 1.263
> diff -u -r1.263 configure
> --- configure	14 Apr 2006 23:33:34 -0000	1.263
> +++ configure	24 Apr 2006 06:28:09 -0000
> @@ -1264,6 +1264,7 @@
>  if test "$v4l2" = "yes"; then
>  # check for video4linux2 --- V4L2_PIX_FMT_YUV420
>  cat > $TMPC << EOF
> +#include <sys/types.h>
>  #include <sys/time.h>
>  #include <linux/videodev.h>
>  int dummy = V4L2_PIX_FMT_YUV420;
>   
> ------------------------------------------------------------------------
>
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