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GetID3 - Bloc informations de fichiers
9 avril 2013, par
Mis à jour : Mai 2013
Langue : français
Type : Image
Autres articles (56)
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Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
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Sur d’autres sites (9673)
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Interpreting ffmpeg output in Python
11 juin 2020, par Luka MilivojevicI started working in FFmpeg and I want to create a list that will contain start and end timestamps of silence intervals. I did print out these intervals using the FFmpeg but I need to format that output so it looks a bit more readable, so that is why I want to create a list out of it and then print it using a custom function. I know that I should go with regex here but I am not sure how should I write it nor how should I read the FFmpeg console output. My function for silence detection looks like :



def detect_silence_ffmpeg():
 command = r"ffmpeg -i audio.wav -af silencedetect=n=-40dB:d=0.5 -f null - "
 subprocess.call(command, shell=True)




And the output of this function on a 7 second long sample video is :



ffmpeg version git-2020-06-03-b6d7c4c Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 9.3.1 (GCC) 20200523
 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
 libavutil 56. 49.100 / 56. 49.100
 libavcodec 58. 90.100 / 58. 90.100
 libavformat 58. 44.100 / 58. 44.100
 libavdevice 58. 9.103 / 58. 9.103
 libavfilter 7. 84.100 / 7. 84.100
 libswscale 5. 6.101 / 5. 6.101
 libswresample 3. 6.100 / 3. 6.100
 libpostproc 55. 6.100 / 55. 6.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from 'audio.wav':
 Metadata:
 encoder : Lavf58.44.100
 Duration: 00:00:07.34, bitrate: 1411 kb/s
 Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
Stream mapping:
 Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
 Metadata:
 encoder : Lavf58.44.100
 Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
 Metadata:
 encoder : Lavc58.90.100 pcm_s16le
[silencedetect @ 00000202fc71e680] silence_start: 0
[silencedetect @ 00000202fc71e680] silence_end: 1.16374 | silence_duration: 1.16374
[silencedetect @ 00000202fc71e680] silence_start: 1.94558
[silencedetect @ 00000202fc71e680] silence_end: 3.41345 | silence_duration: 1.46787
[silencedetect @ 00000202fc71e680] silence_start: 3.8578
[silencedetect @ 00000202fc71e680] silence_end: 5.84844 | silence_duration: 1.99063
[silencedetect @ 00000202fc71e680] silence_start: 6.43653
size=N/A time=00:00:07.33 bitrate=N/A speed= 308x 
video:0kB audio:1264kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[silencedetect @ 00000202fc71e680] silence_end: 7.33868 | silence_duration: 0.902154




And this code should be implemented on an hour or so long videos so I really need to find a way to format this output a bit better than this. That would be it, any help would be much appreciated :)



P.S : the idea is that this should work on Windows mainly, but if the cross-platform is possible too it would be great.


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FFmpeg installation on Raspberry Pi Zero W : Undefined references to __atomic
3 février 2021, par MisterGrayI'm trying to install ffmpeg on my Raspberry Pi Zero W, but I get several error messages.


OS : Raspberry Pi OS (32-bit) Lite (May 2020)


I have executed the following commands :


sudo apt update
sudo apt full-upgrade
sudo apt install git
git clone https://github.com/FFmpeg/FFmpeg.git
cd FFmpeg
./configure --arch=armel --target-os=linux --enable-gpl --enable-omx --enable-omx-rpi --enable-nonfree
make -j2
sudo make install



Output of last command :


...
LD ffmpeg_g
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_init':
/home/pi/FFmpeg/libavformat/fifo.c:519: undefined reference to `__atomic_store_8'
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_write_trailer':
/home/pi/FFmpeg/libavformat/fifo.c:624: undefined reference to `__atomic_fetch_add_8'
/usr/bin/ld: /home/pi/FFmpeg/libavformat/fifo.c:631: undefined reference to `__atomic_store_8'
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_thread_write_packet':
/home/pi/FFmpeg/libavformat/fifo.c:188: undefined reference to `__atomic_fetch_sub_8'
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_consumer_thread':
/home/pi/FFmpeg/libavformat/fifo.c:457: undefined reference to `__atomic_load_8'
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_write_packet':
/home/pi/FFmpeg/libavformat/fifo.c:597: undefined reference to `__atomic_fetch_add_8'
collect2: error: ld returned 1 exit status
make: *** [Makefile:114: ffmpeg_g] Error 1



Maybe another package is missing ? Do I have to change anything in the config ?


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Why are there vaapi filters that exist in libavfilter but do not exist in my compiled version of ffmpeg ?
13 juin 2020, par John AllardI've compiled the most recent snapshot of ffmpeg with
vaapi
enabled


$ ffmpeg -hwaccesls
ffmpeg version N-98129-g0b182ff Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
 configuration: --disable-debug --disable-doc --disable-ffplay --enable-shared --enable-avresample --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-gpl --enable-libass --enable-fontconfig --enable-libfreetype --enable-libvidstab --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxvid --enable-libx264 --enable-nonfree --enable-openssl --enable-libfdk_aac --enable-postproc --enable-small --enable-version3 --enable-libzmq --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-libopenjpeg --enable-libkvazaar --enable-libaom --extra-libs=-lpthread --enable-libsrt --enable-vaapi --extra-cflags=-I/opt/ffmpeg/include --extra-ldflags=-L/opt/ffmpeg/lib
 libavutil 56. 54.100 / 56. 54.100
 libavcodec 58. 92.100 / 58. 92.100
 libavformat 58. 46.101 / 58. 46.101
 libavdevice 58. 11.100 / 58. 11.100
 libavfilter 7. 86.100 / 7. 86.100
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 8.100 / 5. 8.100
 libswresample 3. 8.100 / 3. 8.100
 libpostproc 55. 8.100 / 55. 8.100
Hardware acceleration methods:
vaapi




I know that
vaapi
is working because I can use it for hardware decoding and encoding of h264 videos. I can see somevaapi
filters as well


$ ffmpeg -filters | grep vaapi
 ... deinterlace_vaapi V->V (null)
 ... denoise_vaapi V->V (null)
 ... procamp_vaapi V->V (null)
 ... scale_vaapi V->V (null)
 ... sharpness_vaapi V->V (null)




However, I notice that this list is missing the filter that I'm specifically looking for, namely ,
transpose_vaapi
. If you look in the libavfilter source code you'll see the following


This shows the
transpose_vaapi
filter defined in theallfilters.c
file
https://github.com/FFmpeg/FFmpeg/blob/master/libavfilter/allfilters.c#L414


This shows the
transpose_vaapi
filter source code
https://github.com/FFmpeg/FFmpeg/blob/master/libavfilter/vf_transpose_vaapi.c


If the filter is defined in source code, it's defined in
allfilters.c
, and I've compiled ffmpeg from this source withvaapi
enabled, why can I not use this filter with ffmpeg ?


$ ffmpeg -y -hide_banner -nostats -loglevel error \
 -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi \
 -i ./test_video.mp4 \
 -vf 'format=nv12,transpose_vaapi=2' \
 -c:v h264_vaapi \
 /tmp/rotated_video.mp4
[AVFilterGraph @ 0xf14000] No such filter: 'transpose_vaapi'
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument




EDIT -



Looking through the source code for
vf_transpose_vaapi.c
I see the following logic


if (!pipeline_caps.rotation_flags) {
 av_log(avctx, AV_LOG_ERROR, "VAAPI driver doesn't support transpose\n");
 return AVERROR(EINVAL);
 }




that's inside of the
transpose_vaapi_build_filter_params
function which is part of the filter initialization process. I guess it's possible that, if that call failed, the filter would fail to be built and it would not be registered as a valid filter ? This seems like something that would happen at runtime when I attempt to run the filter rather than something that would happen at compile time when setting which filters are defined.