Opened 8 years ago

Last modified 8 years ago

#1927 open defect

Seek bug in rv40 video after resolution change — at Initial Version

Reported by: DonMoir Owned by:
Priority: normal Component: undetermined
Version: git-master Keywords: real
Cc: Blocked By:
Blocking: Reproduced by developer: yes
Analyzed by developer: no

Description

After the resolution changes in the attached file which is from ticket #1507, any attempt to seek to absolute zero will cause distortion. For the video stream, the first index entry timestamp is zero and the first_dts is zero. Any value greater than zero and it works. The reason for the distortion is because the packets contain the old resolution values, as does the AVFrame and AVCodecContext.

You can seek to zero fine before the resolution change.

The best way to show you the problem is to make ffplay loop. This is because using left arrow does not go back far enough in time to produce the problem and by allowing ffplay to loop it will seek to zero or to the very beginning of playback.

This is not an ffplay problem as I can reproduce it in my own code.

After the loop back to zero it will correct itself and get the resolution change about 6/7 seconds into playback.

ffplay -loop 10 Wrong_aspect_after_resolution_change.rmvb
ffplay version N-46469-gc995644 Copyright (c) 2003-2012 the FFmpeg developers

built on Nov 5 2012 17:56:17 with gcc 4.7.2 (GCC)
configuration: --disable-static --enable-shared --enable-gpl --enable-version3

--disable-pthreads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib

--enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-
amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut -
-enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger -
-enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --
enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enab
le-libxavs --enable-libxvid --enable-zlib

libavutil 52. 5.100 / 52. 5.100
libavcodec 54. 71.100 / 54. 71.100
libavformat 54. 36.100 / 54. 36.100
libavdevice 54. 3.100 / 54. 3.100
libavfilter 3. 21.106 / 3. 21.106
libswscale 2. 1.102 / 2. 1.102
libswresample 0. 16.100 / 0. 16.100
libpostproc 52. 1.100 / 52. 1.100

Input #0, rm, from 'Wrong_aspect_after_resolution_change.rmvb':

Metadata:

Audiences : Easy RealMedia? Tool's Audience;
audioMode : music
Creation Date : 3/22/2005 10:25:31
Description : +ú+++·+˜ú¦¦+-+¦¦+«¦¼+¦íó++-++·+¦+++Ñ-¬-°ú¼+÷¦¬+÷+-+¦-++¦+˜


: -¦íó++-˜+«++íú¦+¦t+¦¦µ+¿¦T+¡¦t+¦¦½-+-·+-íú++¦++T+»+=+÷+-¦+

¦+¦½+¬¦

Email : rick@redcheek.net
Generated By : Easy RealMedia? Tools V1.8
HomeWeb? : http://redcheek.net
Keywords :
Modification Date: 3/22/2005 10:25:31
videoMode : sharp
File ID : 545932b0-2885-caea-bdd7-d268c869a693
title : [YY]0419.¦++-+¦¦¦_¦¦¦·+t+¦+-+n-O-¦f(+-)- -++-¦8 +¦-([YY]¦ñ

+˜-- YYTvO+¦+˜

author : feng
copyright : YY@2005
comment :

Duration: 00:43:16.92, start: 0.000000, bitrate: 7 kb/s

Stream #0:0: Audio: cook (cook / 0x6B6F6F63), 44100 Hz, stereo, fltp, 44 kb/s
Stream #0:1: Video: rv40 (RV40 / 0x30345652), yuv420p, 480x360, 391 kb/s, 23

fps, 23 tbr, 1k tbn, 1k tbc

Frame changed from size:0x0 to size:480x360 97KB sq= 0B f=0/0

15.74 A-V: -0.017 f[rv40 @ 0119d800] d= Changing dimensions to 480x288
15.82 A-V: -0.021 fd= 7 aq= 1KB vq= 28KB sq= Frame changed from size:

480x360 to size:480x288

39.3[rv40 @ 0117dc20] 6 AFirst slice header is incorrectB f=0/0

[rv40 @ 0119d800] warning: first frame is no keyframe 0B f=0/0

9.76 A-V: -0.004[rv40 @ 0119d800] fdChanging dimensions to 480x360
9.83 A-V: -0.008 fd= 60 aq= 1KB vq= 4Frame changed from size:480x288 to

size:480x360

12.34 A-V: 0.086 fd= 62 aq= 1KB vq= 17KB sq= 0B f=0/1

Change History (1)

Changed 8 years ago by DonMoir

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