#253: invalid stream time_base for avi/aac, after av_write_header()
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Reporter: Andrew | Owner:
Type: defect | Status: open
Priority: normal | Component: avformat
Version: git-master | Resolution:
Keywords: avi aac after av_write_header stream | Blocked By:
time_base | Reproduced: 0
Blocking: |
Analyzed: 0 |
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Comment (by rhuddusa):
I think I am seeing the same issue , trying to convert to AC3 inside AVI
container.
Regardless if I use 2 channel or 6 channel, i get 4/125 for audio stream
time_base. unfortunately, when playing on an xbox360, only the 2 channel
will play, and the 6 channel will fail. i have another video which does
play on the xbox360 (which I did not encode), it has 6 channels,
sample_rate=48000.000000, and time_base=1/56000. so it is possible to
play 6 channel ac3 on the xbox360 in the avi format.
this is the failing video:
ffmpeg -i '/mnt/storage/tmp/Input.mkv' -map 0.0 -vcodec libxvid -vtag
XVID -qmin 1.1 -qmax 45 -b 10000k -bt 4500k -maxrate 15000k -bufsize
20000k -level 5 -bf 1 -vsync 1 -sn -async 1000 -map 0.1 -acodec ac3_fixed
-ac 6 -ab 448k -ar 48000 -channel_layout 1551 -f avi -y 'Output.avi'
ffmpeg version N-31897-g10b7b4a, Copyright (c) 2000-2011 the FFmpeg
developers
built on Aug 14 2011 22:10:45 with gcc 4.4.3
configuration: --disable-static --enable-shared --enable-gpl --enable-
nonfree --disable-stripping --enable-postproc --enable-runtime-cpudetect
--enable-libfaac --enable-libmp3lame --enable-zlib --enable-libvorbis
--enable-libopenjpeg --enable-libspeex --enable-libdirac --enable-
libtheora --enable-libschroedinger --enable-libx264 --enable-libvpx
--enable-libxvid --disable-ffserver
libavutil 51. 12. 0 / 51. 12. 0
libavcodec 53. 10. 0 / 53. 10. 0
libavformat 53. 7. 0 / 53. 7. 0
libavdevice 53. 3. 0 / 53. 3. 0
libavfilter 2. 31. 1 / 2. 31. 1
libswscale 2. 0. 0 / 2. 0. 0
libpostproc 51. 2. 0 / 51. 2. 0
[matroska,webm @ 0x2557640] Estimating duration from bitrate, this may be
inaccurate
Seems stream 0 codec frame rate differs from container frame rate: 47.95
(20000000/417083) -> 23.98 (24000/1001)
Input #0, :
Duration: 00:55:41.25, start: 0.000000, bitrate: 1536 kb/s
Stream #0.0(eng): Video: h264 (High), yuv420p, 1280x720, SAR 1:1 DAR
16:9, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
Stream #0.1(eng): Audio: dca (DTS), 48000 Hz, 5.1, s16, 1536 kb/s
(default)
[buffer @ 0x255c740] w:1280 h:720 pixfmt:yuv420p tb:1/1000000 sar:1/1
sws_param:
Output #0, avi,:
Metadata:
Stream #0.0(eng): Video: mpeg4, yuv420p, 1280x720 [SAR 1:1 DAR 16:9],
q=1-45, 10000 kb/s, 23.98 tbn, 23.98 tbc (default)
Stream #0.1(eng): Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s (default)
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
---------------------------------
ffprobe -show_streams Output.avi
[mpeg4 @ 0xc9a6c0] Invalid and inefficient vfw-avi packed B frames
detected
Input #0, avi, :
Metadata:
encoder : Lavf53.7.0
Duration: 00:03:16.35, start: 0.000000, bitrate: 10264 kb/s
Stream #0.0: Video: mpeg4 (Advanced Simple Profile), yuv420p, 1280x720
[SAR 1:1 DAR 16:9], 23.98 tbr, 23.98 tbn, 23.98 tbc
Stream #0.1: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
[STREAM]
index=0
codec_name=mpeg4
codec_long_name=MPEG-4 part 2
codec_type=video
codec_time_base=1001/24000
codec_tag_string=XVID
codec_tag=0x44495658
width=1280
height=720
has_b_frames=1
sample_aspect_ratio=1:1
display_aspect_ratio=16:9
pix_fmt=yuv420p
level=5
r_frame_rate=24000/1001
avg_frame_rate=0/0
time_base=1001/24000
start_time=0.000000
duration=196.321125
nb_frames=4707
[/STREAM]
[STREAM]
index=1
codec_name=ac3
codec_long_name=ATSC A/52A (AC-3)
codec_type=audio
codec_time_base=0/1
codec_tag_string=[0] [0][0]
codec_tag=0x2000
sample_rate=48000.000000
channels=6
bits_per_sample=0
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=4/125
start_time=0.000000
duration=196.352000
nb_frames=6136
[/STREAM]
--
Ticket URL: <http://avcodec.org/trac/ffmpeg/ticket/253#comment:4>
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