[Bug 384479] [NEW] h264: jumpy playback

[Pavel Rojtberg]

Public bug reported:

when playing back a h264 file the video playback is jumpy. This means it stutters forward and backward in time. The video is HD youtube movie.
I file this bug against libavcodec, because both totem and VLC are affected, which afaik use both avacodec for h264.
This does not happen when I use MPlayer. Instead it complains that "first frame is no keyframe", but then plays back the movie fine.

Update:
just found out that MPlayer uses liavcodec as well, but it is not affected by the bug. Here is the output of MPlayer:

ISO: File Type Major Brand: ISO/IEC 14496-1 (MPEG-4 system) v2
Quicktime/MOV file format detected.
[mov] Audio stream found, -aid 0
[mov] Video stream found, -vid 1
VIDEO:  [avc1]  1280x720  24bpp  23.999 fps    0.0 kbps ( 0.0 kbyte/s)
xscreensaver_disable: Could not find XScreenSaver window.
GNOME screensaver disabled
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
==========================================================================
==========================================================================
Forced audio codec: mad
Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
AUDIO: 44100 Hz, 2 ch, s16le, 125.1 kbit/8.87% (ratio: 15639->176400)
Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio) decoder)
==========================================================================
AO: [pulse] 44100Hz 2ch s16le (2 bytes per sample)
Starting playback...
[h264 @ 0x8972350]warning: first frame is no keyframe
VDec: vo config request - 1280 x 720 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
VO: [xv] 1280x720 => 1280x720 Planar YV12

** Affects: vlc (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

- Binary package hint: libavcodec-unstripped-52
- 
  when playing back a h264 file the video playback is jumpy. This means it stutters forward and backward in time. The video is HD youtube movie.
  I file this bug against libavcodec, because both totem and VLC are affected, which afaik use both avacodec for h264.
  This does not happen when I use MPlayer. Instead it complains that "first frame is no keyframe", but then plays back the movie fine.
+ 
+ Update:
+ just found out that MPlayer uses liavcodec as well, but it is not affected by the bug. Here is the output of MPlayer:
+ 
+ ISO: File Type Major Brand: ISO/IEC 14496-1 (MPEG-4 system) v2
+ Quicktime/MOV file format detected.
+ [mov] Audio stream found, -aid 0
+ [mov] Video stream found, -vid 1
+ VIDEO:  [avc1]  1280x720  24bpp  23.999 fps    0.0 kbps ( 0.0 kbyte/s)
+ xscreensaver_disable: Could not find XScreenSaver window.
+ GNOME screensaver disabled
+ ==========================================================================
+ Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
+ Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
+ ==========================================================================
+ ==========================================================================
+ Forced audio codec: mad
+ Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
+ AUDIO: 44100 Hz, 2 ch, s16le, 125.1 kbit/8.87% (ratio: 15639->176400)
+ Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio) decoder)
+ ==========================================================================
+ AO: [pulse] 44100Hz 2ch s16le (2 bytes per sample)
+ Starting playback...
+ [h264 @ 0x8972350]warning: first frame is no keyframe
+ VDec: vo config request - 1280 x 720 (preferred colorspace: Planar YV12)
+ VDec: using Planar YV12 as output csp (no 0)
+ Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
+ VO: [xv] 1280x720 => 1280x720 Planar YV12

** Package changed: ffmpeg (Ubuntu) => vlc (Ubuntu)

-- 
h264: jumpy playback
https://bugs.launchpad.net/bugs/384479
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