Hallo
> Some days ago, I was posting the following message to the list. Apparently, I
> did not receive any reply. Beg your pardon for my impatience. But can
> somebody help?
Some things take more time.
I have attached a little patch. Now lav2wav will happly create "sound of
silence"
If the file does not have a valid audio file it creates a 44.1kHz 16Bit
Stereo silence (00000000 hex). At least it worked for me.
I'm a bit unsoure if the value is correct with only zeros.
If it works, I'll commit it to the CVS, but I think it will be a
optional feature. You can enable it with a command line option to create
silence instead of stopping.
auf hoffentlich bald,
Berni the Chaos of Woodquarter
Email: [EMAIL PROTECTED]
www: http://www.lysator.liu.se/~gz/bernhard
--- lav2wav.c.orig 2003-10-09 17:03:21.269003184 +0200
+++ mjpeg_play/lavtools/lav2wav.c 2003-10-09 18:08:25.543463248 +0200
@@ -163,7 +163,7 @@
int argc;
char **argv;
{
- int n,f;
+ int n,f,i;
int res;
int warned = 0;
int start_frame = 0;
@@ -207,44 +207,15 @@
if(!el.has_audio)
{
- mjpeg_error("Input file(s) have no audio");
- exit(1);
- }
-
- if(!ignore_bitrate)
- {
- if(el.audio_bits!=16)
- {
- mjpeg_error("Input file(s) must have 16 bit audio!");
- exit(1);
- }
-
- switch (el.audio_rate) {
- case 48000 :
- case 44100 :
- case 32000 :
- break;
- default:
- mjpeg_error("Audio rate is %ld Hz",el.audio_rate);
- mjpeg_error("Audio rate must be 32000, 44100 or 48000 !");
- exit(1);
- }
- }
+ /* old version */
+ /*mjpeg_error("Input file(s) have no audio"); */
+ /*exit(1); */
- switch (el.audio_chans) {
- case 1:
- case 2:
- break;
-
- default:
- mjpeg_error("Audio channels %d not allowed",el.audio_chans);
- exit(1);
- }
-
/* Create wav header (skeleton) on stdout ... */
- wav_header( el.audio_bits, el.audio_rate, el.audio_chans, 1);
+ /* audio_bits, audio_rate, audio_chans */
+ wav_header( 16, 44100, 2, 1);
/* skip to the start frame if specified */
- f = 0;
+ f = 0;
if (start_frame != 0)
f = start_frame;
/* num_frames = -1, read em all, else read specified # */
@@ -254,30 +225,81 @@
/* Stream out audio wav-style... in per-frame chunks */
for( ; f < num_frames; ++f )
{
- n = el_get_audio_data(audio_buff, f, &el, 0);
- if( n < 0 )
- {
- mjpeg_error_exit1( "%s: Couldn't get audio for frame %d!",
argv[0], f );
- }
- if( n != 0 )
- {
- res = do_write( 1, audio_buff, n );
- if( res != n )
- {
- mjpeg_error_exit1( "%s: Couldn't write audio for frame
%d!", argv[0], f );
- exit(1);
- }
- }
-
- else if( f < num_frames && ! warned )
- {
- mjpeg_warn( "%s: audio ends early at frame %d", argv[0], f );
- warned = 1;
- }
+ for ( i = 0; i < 1764; i++)
+ res = do_write (1, "\x0000000", 4);
+ }
+
+ wav_close(1);
+ exit(0);
+ }
+
+ if (!ignore_bitrate)
+ {
+ if(el.audio_bits!=16)
+ {
+ mjpeg_error("Input file(s) must have 16 bit audio!");
+ exit(1);
+ }
+
+ switch (el.audio_rate) {
+ case 48000 :
+ case 44100 :
+ case 32000 :
+ break;
+ default:
+ mjpeg_error("Audio rate is %ld Hz",el.audio_rate);
+ mjpeg_error("Audio rate must be 32000, 44100 or 48000 !");
+ exit(1);
}
+ }
+
+ switch (el.audio_chans) {
+ case 1:
+ case 2:
+ break;
+
+ default:
+ mjpeg_error("Audio channels %d not allowed",el.audio_chans);
+ exit(1);
+ }
+
+ /* Create wav header (skeleton) on stdout ... */
+ wav_header( el.audio_bits, el.audio_rate, el.audio_chans, 1);
+ /* skip to the start frame if specified */
+ f = 0;
+ if (start_frame != 0)
+ f = start_frame;
+ /* num_frames = -1, read em all, else read specified # */
+ if ( num_frames == -1)
+ num_frames = el.video_frames;
+
+ /* Stream out audio wav-style... in per-frame chunks */
+ for( ; f < num_frames; ++f )
+ {
+ n = el_get_audio_data(audio_buff, f, &el, 0);
+ if( n < 0 )
+ {
+ mjpeg_error_exit1( "%s: Couldn't get audio for frame %d!",
argv[0], f );
+ }
+ if( n != 0 )
+ {
+ res = do_write( 1, audio_buff, n );
+ if( res != n )
+ {
+ mjpeg_error_exit1( "%s: Couldn't write audio for frame
%d!", argv[0], f );
+ exit(1);
+ }
+ }
+
+ else if( f < num_frames && ! warned )
+ {
+ mjpeg_warn( "%s: audio ends early at frame %d", argv[0], f );
+ warned = 1;
+ }
+ }
- wav_close(1);
- exit(0);
+ wav_close(1);
+ exit(0);
}
