Decoding of a 20 minutes dvvideo / avi sample stops around 4:56 minutes.

[naciselim]

Summary of the bug: Have bunch of videos that I had captured from a miniDV tape as dvvideo (almost 30 mbps). I captured them by using a Windows Media Center version of Windows almost 10 years ago. When I try to convert them to libx264/aac, encoding stops around 4:56 minutes.
How to reproduce:
See the report file. If needed I can share a link to the original file (4GB).

[naciselim]

Log file for ticket 4086. Encoding stops around 4:56 mins.

[Carl Eugen Hoyos]

Please provide a sample that allows to reproduce your issue.

[naciselim]

Could you download from here ​https://drive.google.com/file/d/0BwIOXMWrusS2T0VmeGZhOEUweXM/view?usp=sharing_eid ?

[relaxed]

Please change the sharing preferences for this file to "Public", so that we don't need a drive account or need to ask permission to download it.

[naciselim]

Sorry for that. Just changed. Could you retry? The only requirement is to use the link above to access it.

[relaxed]

The download works now, thanks. I think this an FFmpeg regression because it fails at the spot you mentioned using today's git master, and with the latest mpv. And, oddly, ffmpeg exits with a 0 status when this happens.

However, I have an older version of mplayer2 around and it decodes the entire video properly. It's linked against the following libs:

MPlayer2 9d6b188 (C) 2000-2012 MPlayer Team
<..snip..>
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2 SSSE3 CMOV
Compiled against libavutil version 52.8.0
Compiled against libavcodec version 54.41.1
Compiled against libavformat version 54.21.3
Compiled against libswscale version 2.1.1

I hope this helps.

[Carl Eugen Hoyos]

Regression since dd0429e1 / 756547ce

[naciselim]

Is there an easy way for me to pull the older lib(s) sources and compile?

[jamal]

Replying to naciselim:

Is there an easy way for me to pull the older lib(s) sources and compile?

You can use "git checkout dd0429e1" to reset your local tree to that commit, or searching for it on ​http://git.videolan.org/?p=ffmpeg.git and downloading a snapshot.

If you feel confident enough you could instead look at the changes 756547ce introduced and manually undo them in an up-to-date tree, and see if that works.
The commit that introduced the regression is pretty old, and you'd be missing a lot of development if you compile a snapshot that old.

[Carl Eugen Hoyos]

You can either search for n = avi->dv_demux ? 0 : get_stream_idx(d); in libavformat/avidec.c and make it n = get_stream_idx(d); or use FFmpeg 1.2.10.

[naciselim]

Yes, thanks, I did this change and the video worked. However, I did some extra changes also. Please let me know if they were needed or harm in a way:

$ diff -C 5 avidec.c.orig avidec.c
*** avidec.c.orig       2014-11-06 23:25:43.827512100 -0800
--- avidec.c    2014-11-06 23:31:47.626320200 -0800
***************
*** 1148,1158 ****
          if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
              avio_skip(pb, 4);
              goto start_sync;
          }

!         n = avi->dv_demux ? 0 : get_stream_idx(d);

          if (!((i - avi->last_pkt_pos) & 1) &&
              get_stream_idx(d + 1) < s->nb_streams)
              continue;

--- 1148,1159 ----
          if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
              avio_skip(pb, 4);
              goto start_sync;
          }

!         // n = avi->dv_demux ? 0 : get_stream_idx(d);
!       n = get_stream_idx(d);

          if (!((i - avi->last_pkt_pos) & 1) &&
              get_stream_idx(d + 1) < s->nb_streams)
              continue;

***************
*** 1720,1735 ****
      AVStream *st;
      int i, index;
      int64_t pos, pos_min;
      AVIStream *ast;

-     /* Does not matter which stream is requested dv in avi has the
-      * stream information in the first video stream.
-      */
-     if (avi->dv_demux)
-         stream_index = 0;
-
      if (!avi->index_loaded) {
          /* we only load the index on demand */
          avi_load_index(s);
          avi->index_loaded |= 1;
      }
--- 1721,1730 ----
***************
*** 1758,1768 ****

      if (CONFIG_DV_DEMUXER && avi->dv_demux) {
          /* One and only one real stream for DV in AVI, and it has video  */
          /* offsets. Calling with other stream indexes should have failed */
          /* the av_index_search_timestamp call above.                     */
!
          if (avio_seek(s->pb, pos, SEEK_SET) < 0)
              return -1;

          /* Feed the DV video stream version of the timestamp to the */
          /* DV demux so it can synthesize correct timestamps.        */
--- 1753,1764 ----

      if (CONFIG_DV_DEMUXER && avi->dv_demux) {
          /* One and only one real stream for DV in AVI, and it has video  */
          /* offsets. Calling with other stream indexes should have failed */
          /* the av_index_search_timestamp call above.                     */
!         av_assert0(stream_index == 0);
!
          if (avio_seek(s->pb, pos, SEEK_SET) < 0)
              return -1;

          /* Feed the DV video stream version of the timestamp to the */
          /* DV demux so it can synthesize correct timestamps.        */

tt@NaciTT ~/ffmpeg/libavformat

[Michael Niedermayer]

Fixed in f0ae0354d3f04c369257c2a28557524d28c5df15