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Granite de l’Aber Ildut
9 septembre 2011, par
Mis à jour : Septembre 2011
Langue : français
Type : Texte
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Géodiversité
9 septembre 2011, par ,
Mis à jour : Août 2018
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Sur d’autres sites (7368)
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Python FFmpeg Video Streaming : how to capture multiple representations (resolutions) with webcam
11 avril 2024, par LUKA TADIĆI am trying to capture webcam stream and make HLS stream. I managed to create HLS stream for one Representation (only one stream resolution) but when I try to create (hls.output) more than one, I get this error :


C:\Users\ltadic\Desktop\hls stream>C:/Users/ltadic/AppData/Local/Programs/Python/Python311/python.exe "c:/Users/ltadic/Desktop/hls stream/camera_stream.py"
ERROR:root:ffmpeg failed to execute command: b"ffmpeg version 2022-12-11-git-c3e20f78b0-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers\r\n built with gcc 12.1.0 (Rev2, Built by MSYS2 project)\r\n 
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint\r\n libavutil 57. 43.100 / 57. 43.100\r\n libavcodec 59. 55.100 / 59. 55.100\r\n libavformat 59. 34.102 / 59. 34.102\r\n libavdevice 59. 8.101 / 59. 8.101\r\n libavfilter 8. 52.100 / 8. 52.100\r\n libswscale 6. 8.112 / 6. 8.112\r\n libswresample 4. 9.100 / 4. 9.100\r\n libpostproc 56. 7.100 / 56. 7.100\r\nInput #0, dshow, from 'video=Fantech Luminous C30':\r\n Duration: N/A, start: 1593.585118, bitrate: N/A\r\n Stream #0:0: Video: mjpeg (Baseline) (MJPG / 0x47504A4D), yuvj420p(pc, bt470bg/bt709/unknown), 1920x1080, 25 fps, 25 tbr, 10000k tbn\r\n[dshow @ 0000018b1c4d4280] Could not run graph (sometimes caused by a device already in use by other application)\r\nvideo=Fantech Luminous C30: I/O error\r\n"
Traceback (most recent call last):
 File "c:\Users\ltadic\Desktop\hls stream\camera_stream.py", line 13, in <module>
 hls.output('C:\\Users\\ltadic\\Desktop\\camera_stream\\hls1.m3u8')
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_media.py", line 93, in output
 self.run(ffmpeg_bin, monitor, **options)
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_media.py", line 121, in run 
 asyncio.run(self.async_run(ffmpeg_bin, monitor, **options))
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 190, in run
 return runner.run(main)
 ^^^^^^^^^^^^^^^^
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 118, in run
 return self._loop.run_until_complete(task)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\asyncio\base_events.py", line 650, in run_until_complete
 return future.result()
 ^^^^^^^^^^^^^^^
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_media.py", line 112, in async_run
 self._run(ffmpeg_bin, monitor, **options)
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_media.py", line 106, in _run
 self.pipe, err = process.run()
</module>

This is my code :


import ffmpeg_streaming
from ffmpeg_streaming import Formats,Bitrate, Representation, Size 

video = ffmpeg_streaming.input('Fantech Luminous C30', capture = True)

_360p = Representation(Size(640, 360), Bitrate(276 * 1024, 128 * 1024))
_480p = Representation(Size(854, 480), Bitrate(750 * 1024, 192 * 1024))
_720p = Representation(Size(1280, 720), Bitrate(2048 * 1024, 320 * 1024))

hls = video.hls(Formats.h264(),hls_list_size=10, hls_time=5)
hls.flags('delete_segments')
hls.representations(_360p, _480p, _720p)
hls.output('C:\\Users\\ltadic\\Desktop\\camera_stream\\hls1.m3u8')



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How to generate HLS stream multiple qualities (Representations) while capturing webcam
27 janvier 2023, par LUKA TADIĆI want to generate multiple qualities (Representations) for HLS stream while capturing from webcam. I am using ffmpeg_streaming python package. I can generate one quality (Representation) at a time, but when i try to generate more than one, I get this error :


C:\Users\ltadic\Desktop\hls stream>C:/Users/ltadic/AppData/Local/Programs/Python/Python311/python.exe "c:/Users/ltadic/Desktop/hls stream/camera_stream.py"
ERROR:root:ffmpeg failed to execute command: b"ffmpeg version 2022-12-11-git-c3e20f78b0-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers\r\n built with gcc 12.1.0 (Rev2, Built by MSYS2 project)\r\n 
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint\r\n libavutil 57. 43.100 / 57. 43.100\r\n libavcodec 59. 55.100 / 59. 55.100\r\n libavformat 59. 34.102 / 59. 34.102\r\n libavdevice 59. 8.101 / 59. 8.101\r\n libavfilter 8. 52.100 / 8. 52.100\r\n libswscale 6. 8.112 / 6. 8.112\r\n libswresample 4. 9.100 / 4. 9.100\r\n libpostproc 56. 7.100 / 56. 7.100\r\nInput #0, dshow, from 'video=Fantech Luminous C30':\r\n Duration: N/A, start: 1593.585118, bitrate: N/A\r\n Stream #0:0: Video: mjpeg (Baseline) (MJPG / 0x47504A4D), yuvj420p(pc, bt470bg/bt709/unknown), 1920x1080, 25 fps, 25 tbr, 10000k tbn\r\n[dshow @ 0000018b1c4d4280] Could not run graph (sometimes caused by a device already in use by other application)\r\nvideo=Fantech Luminous C30: I/O error\r\n"
Traceback (most recent call last):
 File "c:\Users\ltadic\Desktop\hls stream\camera_stream.py", line 13, in <module>
 hls.output('C:\\Users\\ltadic\\Desktop\\camera_stream\\hls1.m3u8')
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_media.py", line 93, in output
 self.run(ffmpeg_bin, monitor, **options)
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_media.py", line 121, in run 
 asyncio.run(self.async_run(ffmpeg_bin, monitor, **options))
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 190, in run
 return runner.run(main)
 ^^^^^^^^^^^^^^^^
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 118, in run
 return self._loop.run_until_complete(task)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\asyncio\base_events.py", line 650, in run_until_complete
 return future.result()
 ^^^^^^^^^^^^^^^
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_media.py", line 112, in async_run
 self._run(ffmpeg_bin, monitor, **options)
 File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_media.py", line 106, in _run
 self.pipe, err = process.run()
</module>

This is the code :


import ffmpeg_streaming
from ffmpeg_streaming import Formats,Bitrate, Representation, Size 

video = ffmpeg_streaming.input('Fantech Luminous C30', capture = True)

_360p = Representation(Size(640, 360), Bitrate(276 * 1024, 128 * 1024))
_480p = Representation(Size(854, 480), Bitrate(750 * 1024, 192 * 1024))
_720p = Representation(Size(1280, 720), Bitrate(2048 * 1024, 320 * 1024))

hls = video.hls(Formats.h264(),hls_list_size=10, hls_time=5)
hls.flags('delete_segments')
hls.representations(_360p, _480p, _720p)
hls.output('C:\\Users\\ltadic\\Desktop\\camera_stream\\hls1.m3u8')


I was expecting to get _360p, _480p and _720p qualities, but my program crashes. If I try same thing for DASH stream, I generate these qualities without any problem.


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Trying to convert a VideoCD MPEG to MP4 using ffmpeg
27 février 2023, par Niels BosmaI'm trying to convert a VideoCD MPEG to MP4 using :


FFMPEG 5.1


ffmpeg.exe -nostdin -y -loglevel info -hide_banner -i "ITEM0010.DAT" -c:v libx264 -crf 18 -qscale:v 3 -c:a aac -ar 96000 -map_metadata -1 "output.mp4"


I'm getting :


[mpeg @ 0000024b81bf4480] start time for stream 1 is not set in estimate_timings_from_pts
[mpeg @ 0000024b81bf4480] stream 1 : no TS found at start of file, duration not set
[mpeg @ 0000024b81bf4480] Could not find codec parameters for stream 1 (Audio: mp2, 0 channels, s16p): unspecified frame size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mpeg, from 'C:\Concierge\ITEM0010.DAT':
 Stream #0:1[0x1c0]: Audio: mp2, 0 channels, s16p
 Stream #0:2[0x1e2]: Video: mpeg1video, yuv420p(tv), 704x576 [SAR 178:163 DAR 1958:1467], 1100 kb/s, 25 tbr, 90k tbn
Stream mapping:
 Stream #0:2 -> #0:0 (mpeg1video (native) -> h264 (libx264))
 Stream #0:1 -> #0:1 (mp2 (native) -> aac (native))
[libx264 @ 0000024b81c86000] -qscale is ignored, -crf is recommended.
[libx264 @ 0000024b81c86000] using SAR=178/163
[libx264 @ 0000024b81c86000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000024b81c86000] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 0000024b81c86000] 264 - core 164 r3095 baee400 - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[abuffer @ 0000024b84979880] Value inf for parameter 'time_base' out of range [0 - 2.14748e+09]
 Last message repeated 1 times
[abuffer @ 0000024b84979880] Error setting option time_base to value 1/0.
[graph_1_in_0_1 @ 0000024b85187c00] Error applying options to the filter.
Error reinitializing filters!
Error while filtering: Result too large
Finishing stream 0:1 without any data written to it.
[abuffer @ 0000024b84979880] Value inf for parameter 'time_base' out of range [0 - 2.14748e+09]
 Last message repeated 1 times
[abuffer @ 0000024b84979880] Error setting option time_base to value 1/0.
[graph_1_in_0_1 @ 0000024b85186b00] Error applying options to the filter.
Error configuring filter graph
[libx264 @ 0000024b81c86000] frame I:1 Avg QP:22.68 size: 40674
[libx264 @ 0000024b81c86000] mb I I16..4: 3.8% 72.3% 23.9%
[libx264 @ 0000024b81c86000] 8x8 transform intra:72.3%
[libx264 @ 0000024b81c86000] coded y,uvDC,uvAC intra: 88.4% 81.1% 50.3%
[libx264 @ 0000024b81c86000] i16 v,h,dc,p: 43% 13% 0% 43%
[libx264 @ 0000024b81c86000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 16% 20% 5% 5% 6% 5% 7% 6%
[libx264 @ 0000024b81c86000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 20% 8% 5% 9% 8% 8% 6% 4%
[libx264 @ 0000024b81c86000] i8c dc,h,v,p: 42% 23% 28% 7%
[libx264 @ 0000024b


81c86000] kb/s:8134.80
Conversion failed !


The same command using FFMPEG 4.1 works fine.


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