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MediaSPIP 0.1 Beta version
25 avril 2011, parMediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
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Sur d’autres sites (8991)
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avcodec_find_decoder() can't find AV_CODEC_ID_WMAV2 even through CLI can parse WMAs on macOS ?
3 octobre 2023, par grendellI am following the decode_audio.c example from FFmpeg, but I am unable to initialize a parser for
AV_CODEC_ID_WMAV2.

Test code :


#include 
#include <libavcodec></libavcodec>avcodec.h>

int main() {
 // codec is found successfully
 const AVCodec * codec = avcodec_find_decoder(AV_CODEC_ID_WMAV2);
 if (!codec) {
 fprintf(stderr, "codec not found\n");
 return 1;
 }

 // parser is always NULL
 AVCodecParserContext * parser = av_parser_init(codec->id);
 if (!parser) {
 fprintf(stderr, "parser not found\n");
 return 1;
 }

 av_parser_close(parser);
 return 0;
}


Build commands :


clang -c -I/opt/homebrew/Cellar/ffmpeg/6.0_1/include wma2mp3.c -o obj/wma2mp3.o
clang -L/opt/homebrew/Cellar/ffmpeg/6.0_1/lib -lavcodec obj/wma2mp3.o -o wma2mp3


I'm surprised by the fact that the FFmpeg CLI can perform this operation on the same machine :


% ffmpeg -i test.wma test.mp3
ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
 built with Apple clang version 14.0.3 (clang-1403.0.22.14.1)
 configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.0_1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
 libavutil 58. 2.100 / 58. 2.100
 libavcodec 60. 3.100 / 60. 3.100
 libavformat 60. 3.100 / 60. 3.100
 libavdevice 60. 1.100 / 60. 1.100
 libavfilter 9. 3.100 / 9. 3.100
 libswscale 7. 1.100 / 7. 1.100
 libswresample 4. 10.100 / 4. 10.100
 libpostproc 57. 1.100 / 57. 1.100
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, asf, from 'test.wma':
 Metadata:
 ToolName : Windows Media Encoding Utility
 ToolVersion : 8.00.00.0343
 Duration: 00:00:00.74, start: 0.000000, bitrate: 80 kb/s
 Stream #0:0: Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, 1 channels, fltp, 48 kb/s
Stream mapping:
 Stream #0:0 -> #0:0 (wmav2 (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'test.mp3':
 Metadata:
 ToolName : Windows Media Encoding Utility
 ToolVersion : 8.00.00.0343
 TSSE : Lavf60.3.100
 Stream #0:0: Audio: mp3, 44100 Hz, mono, fltp
 Metadata:
 encoder : Lavc60.3.100 libmp3lame
[libmp3lame @ 0x130706320] Queue input is backward in timeed=N/A 
[mp3 @ 0x1307056e0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 15668 >= 14764
size= 8kB time=00:00:00.97 bitrate= 65.8kbits/s speed= 103x 
video:0kB audio:8kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 4.048112%


I am using an Apple M1 machine running MacOS 13.5.2 (22G91).


Is the CLI using a different mechanism than
av_parser_parse2to perform this conversion, and is there a better way to accomplish this via the C API ?

-
doc/html : support texinfo 7.0
8 novembre 2023, par Frank Plowmandoc/html : support texinfo 7.0
Resolves trac ticket #10636 (http://trac.ffmpeg.org/ticket/10636).
Texinfo 7.0, released in November 2022, changed the names of various
functions. Compiling docs with Texinfo 7.0 resulted in warnings and
improperly formatted documentation. More old names appear to have
been removed in Texinfo 7.1, released October 2023, which causes docs
compilation to fail.This commit addresses the issue by adding logic to switch between the old
and new function names depending on the Texinfo version. Texinfo 6.8
produces identical documentation before and after the patch.CC
https://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg1938238.html
https://bugs.gentoo.org/916104Signed-off-by : Frank Plowman <post@frankplowman.com>
-
FFmpeg C API WMAV2 AVCodecParserContext not found even though CLI can parse WMAs on MacOS
3 octobre 2023, par grendellI am following the decode_audio.c example from FFmpeg, but I am unable to initialize a parser for
AV_CODEC_ID_WMAV2.

Test code :


#include 
#include <libavcodec></libavcodec>avcodec.h>

int main() {
 // codec is found successfully
 const AVCodec * codec = avcodec_find_decoder(AV_CODEC_ID_WMAV2);
 if (!codec) {
 fprintf(stderr, "codec not found\n");
 return 1;
 }

 // parser is always NULL
 AVCodecParserContext * parser = av_parser_init(codec->id);
 if (!parser) {
 fprintf(stderr, "parser not found\n");
 return 1;
 }

 av_parser_close(parser);
 return 0;
}


Build commands :


clang -c -I/opt/homebrew/Cellar/ffmpeg/6.0_1/include wma2mp3.c -o obj/wma2mp3.o
clang -L/opt/homebrew/Cellar/ffmpeg/6.0_1/lib -lavcodec obj/wma2mp3.o -o wma2mp3


I'm surprised by the fact that the FFmpeg CLI can perform this operation on the same machine :


% ffmpeg -i test.wma test.mp3
ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
 built with Apple clang version 14.0.3 (clang-1403.0.22.14.1)
 configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.0_1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
 libavutil 58. 2.100 / 58. 2.100
 libavcodec 60. 3.100 / 60. 3.100
 libavformat 60. 3.100 / 60. 3.100
 libavdevice 60. 1.100 / 60. 1.100
 libavfilter 9. 3.100 / 9. 3.100
 libswscale 7. 1.100 / 7. 1.100
 libswresample 4. 10.100 / 4. 10.100
 libpostproc 57. 1.100 / 57. 1.100
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, asf, from 'test.wma':
 Metadata:
 ToolName : Windows Media Encoding Utility
 ToolVersion : 8.00.00.0343
 Duration: 00:00:00.74, start: 0.000000, bitrate: 80 kb/s
 Stream #0:0: Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, 1 channels, fltp, 48 kb/s
Stream mapping:
 Stream #0:0 -> #0:0 (wmav2 (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'test.mp3':
 Metadata:
 ToolName : Windows Media Encoding Utility
 ToolVersion : 8.00.00.0343
 TSSE : Lavf60.3.100
 Stream #0:0: Audio: mp3, 44100 Hz, mono, fltp
 Metadata:
 encoder : Lavc60.3.100 libmp3lame
[libmp3lame @ 0x130706320] Queue input is backward in timeed=N/A 
[mp3 @ 0x1307056e0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 15668 >= 14764
size= 8kB time=00:00:00.97 bitrate= 65.8kbits/s speed= 103x 
video:0kB audio:8kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 4.048112%


I am using an Apple M1 machine running MacOS 13.5.2 (22G91).


Is the CLI using a different mechanism than
av_parser_parse2to perform this conversion, and is there a better way to accomplish this via the C API ?

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