#3233: PSP PMF audio
-------------------------------------+-------------------------------------
Reporter: cehoyos | Owner:
Type: enhancement | Status: new
Priority: wish | Component:
Version: git-master | undetermined
Keywords: mpegps pmf | Resolution:
atrac3 atrac3p videolan | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Comment (by bazz):
== Solution Found for PMF Freezing ==
I have discovered why the ATRAC3+ parsing failed on my PMF sample and have
made a solution.
The problem was that the ATRAC3+ parser did not properly process a buffer
that only contains one full header.
I am attaching both a complete patch (parser.diff), and a patch that shows
only my changes from
https://ffmpeg.org/pipermail/ffmpeg-devel/2014-December/166169.html
(parser_partial.diff)
== ffmpeg Mod to Transcode PMF ==
Using the latest FFmpeg from Github
(7d17d31db4322b0c5e89f889ebf32af9ca2d91a9),
ffplay works out of the box with the PMF patch. But, I found that I have
to modify one more thing for the ffmpeg tool to work. Let me detail the
issue, then provide the solution.
Here is a log of an attempt to transcode a PMF to avi.
{{{
bazz@awesomesauce ~/Code/FFmpeg $ ./ffmpeg -i ~/3rd/008.pmf -vcodec copy
/tmp/derp.avi
ffmpeg version git-2016-09-23-ae2cd8a Copyright (c) 2000-2016 the FFmpeg
developers
built with gcc 4.9.3 (Gentoo 4.9.3 p1.5, pie-0.6.4)
configuration:
libavutil 55. 30.100 / 55. 30.100
libavcodec 57. 57.101 / 57. 57.101
libavformat 57. 50.100 / 57. 50.100
libavdevice 57. 0.102 / 57. 0.102
libavfilter 6. 62.100 / 6. 62.100
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 1.100 / 2. 1.100
[atrac3plus @ 0x3fbedc0] block_align is not set
Input #0, mpeg, from '/home/bazz/3rd/008.pmf':
Duration: 00:00:50.48, start: 0.945211, bitrate: 1320 kb/s
Stream #0:0[0x1e0]: Video: h264 (Main), yuv420p(tv, smpte170m),
480x272 [SAR 1:1 DAR 30:17], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x1bd0]: Audio: atrac3p, 44100 Hz, stereo, 128 kb/s
[abuffer @ 0x404db40] Unable to parse option value "(null)" as sample
format
Last message repeated 1 times
[abuffer @ 0x404db40] Error setting option sample_fmt to value (null).
[graph 0 input from stream 0:1 @ 0x404da40] Error applying options to the
filter
}}}
The issue stems from the fact that `block_align is not set`, because in
`libavcodec/atrac3plusdec.c:147` `atrac3p_decode_init()` will fail in this
case. I can say that commenting out the `block_align` return statement
allows `ffmpeg` to once again apparently run flawlessly with PMF. Let it
be known here that the PMF parser constantly updates the `block_align`
anyways.
Thus, I'm not sure if removing the logic check produces issues for other
users of ATRAC3+, but it at least provides with me a usable latest version
of FFmpeg for the purpose of working with these PMF videos.
Anyhow, I'm attaching this patch as "ffmpeg.diff"
Note: Using a ~Dec 2014 commit of FFmpeg did not require this
modification, but
I did not discover why.
== Closing Remarks ==
Check out the new attachment I added to this ticket `bazz_patches.zip`
Remember, I'm using the latest FFmpeg from Github
(7d17d31db4322b0c5e89f889ebf32af9ca2d91a9)
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3233#comment:5>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
_______________________________________________
FFmpeg-trac mailing list
FFmpeg-trac@avcodec.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-trac
