FFMPEG does not encode the full length of input dv.

[McLinux]

Hi All,

I am using ffmpeg to convert my dv video to DVD Video. For the same I
have used following command:

ffmpeg -i INPUT/0000.avi -vcodec mpeg2video -r 25 -s 704x576 -b 5000
-ab 224 -ar 48000 -ac 2 -hq -deinterlace 0000.mpg
$ ffmpeg -i INPUT/0000.avi -vcodec
mpeg2video -r 25 -s 704x576 -b 5000 -ab 224 -ar 48000 -ac 2 -hq
-deinterlace 0000.mpg
ffmpeg version 0.4.8, build 4717, Copyright (c) 2000-2004 Fabrice Bellard
built on Jul 8 2004 17:14:40, gcc: 3.3.3 20040412 (Red Hat Linux 3.3.3-7)
Input #0, avi, from 'INPUT/0000.avi':
Duration: 00:14:30.4, bitrate: 29829 kb/s
Stream #0.0: Video: dvvideo, 720x576, 25.00 fps
Stream #0.1: Audio: pcm_s16le, 32000 Hz, stereo, 1024 kb/s
Output #0, mpeg, to '0000.mpg':
Stream #0.0: Video: mpeg2video (hq), 704x576, 25.00 fps, q=2-31, 5000 kb/s
Stream #0.1: Audio: mp2, 48000 Hz, stereo, 224 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Press [q] to stop encoding
AC EOB marker is absent pos=640kB time=127.0 bitrate=5248.1kbits/s
AC EOB marker is absent pos=68
AC EOB marker is absent pos=64
AC EOB marker is absent pos=64
AC EOB marker is absent pos=64
AC EOB marker is absent pos=64
frame= 7172 q=3.4 Lsize= 183604kB time=286.0 bitrate=5259.8kbits/s
video:175075kB audio:7819kB global headers:0kB muxing overhead 0.388311%

The problem that is coming up is that I dont have the full length video
in the output file. The length of input file is 14:30 min, but that of
output file is around 4:46 mins only. Any clues as what may be happening
here?

TIA.
-McLinux

[Forum Troll]

One thread is enough.

https://www.videohelp.com/forum/viewtopic.php?t=229699

[McLinux]

Hi Moderator,

I was myself not sure as to which forum this question be fit into, hence in order to get most probable answers, I posrted on both the posts.

Thanks for notifying.

-McLinux

[McLinux]

Well this one got fixed thorugh a patch sent by Roman.
Thanks Roman.
The same is given below:

--- /home/rs76089/tmp/ffmpeg/libavformat/avidec.c	2004-07-13 17:10:06.000000000 -0700
+++ libavformat/avidec.c	2004-08-03 18:22:08.000000000 -0700
@@ -49,6 +49,7 @@
     int64_t  movi_end;
     offset_t movi_list;
     int index_loaded;
+    int is_odml;
     DVDemuxContext* dv_demux;
 } AVIContext;
 
@@ -128,6 +129,10 @@
                 goto end_of_header;
             }
             break;
+        case MKTAG('d', 'm', 'l', 'h'):
+	    avi->is_odml = 1;
+	    url_fskip(pb, size + (size & 1));
+	    break;
         case MKTAG('a', 'v', 'i', 'h'):
 	    /* avi header */
             /* using frame_period is bad idea */
@@ -363,7 +368,8 @@
 {
     AVIContext *avi = s->priv_data;
     ByteIOContext *pb = &s->pb;
-    int n, d[8], size, i;
+    int n, d[8], size;
+    offset_t i;
     void* dstr;
 
     memset(d, -1, sizeof(int)*8);
@@ -377,19 +383,12 @@
     for(i=url_ftell(pb); !url_feof(pb); i++) {
         int j;
 
-	if (i >= avi->movi_end) { /* Let's see if it's an OpenDML AVI */
-	    uint32_t tag, size, tag2;
-	    url_fskip(pb, avi->riff_end - url_ftell(pb));
-	    if (get_riff(avi, pb) < 0)
-	        return -1;
-	    
-	    tag = get_le32(pb);
-	    size = get_le32(pb);
-	    tag2 = get_le32(pb);
-	    if (tag == MKTAG('L','I','S','T') && tag2 == MKTAG('m','o','v','i'))
-	        avi->movi_end = url_ftell(pb) + size - 4; 
-	    else
-	        return -1;
+	if (i >= avi->movi_end) {
+	    if (avi->is_odml) {
+		url_fskip(pb, avi->riff_end - i);
+	        avi->riff_end = avi->movi_end = url_filesize(url_fileno(pb));
+	    } else
+	        break;
 	}
 
         for(j=0; j<7; j++)
@@ -408,6 +407,13 @@
             
             url_fskip(pb, size);
         }
+
+	//parse JUNK
+        if(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K' &&
+           i + size <= avi->movi_end) {
+            
+            url_fskip(pb, size);
+        }
         
         //parse ##dc/##wb
         n= (d[0] - '0') * 10 + (d[1] - '0');