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• ValueError : No valid stream found in input file. Is -1 of the desired media type ?

  20 juin, par Haozhe Xie

  While using torchcodec with the following code

  


  import torchcodec
file_path = "/path/to/episode_000000.mp4"
x = torchcodec.decoders.VideoDecoder(file_path, seek_mode="approximate")


  


  I got the following error :

  


  [rank0]:   File "/home/hzxie/Development/vla/utils/datasets.py", line 202, in _get_video_bytes
[rank0]:     x = torchcodec.decoders.VideoDecoder(vbytes)
[rank0]:   File "/home/hzxie/Applications/miniconda3/envs/lerobot/lib/python3.10/site-packages/torchcodec/decoders/_video_decoder.py", line 98, in __init__
[rank0]:     core.add_video_stream(
[rank0]:   File "/home/hzxie/Applications/miniconda3/envs/lerobot/lib/python3.10/site-packages/torch/_ops.py", line 723, in __call__
[rank0]:     return self._op(*args, **kwargs)
[rank0]: ValueError: No valid stream found in input file. Is -1 of the desired media type?


  


  How to solve this problem ?

  


• Creating a shared library that statically includes ffmpeg

  10 octobre 2017, par El Sampsa

  I’m having hard time trying to create a shared library that has ffmpeg libraries "baked in" as static ones.

  Consider the following directory schema :

  include/
  
    my own .h files
  
    ext/
  
      ffmpeg .h files
  
  lib/
  
    libav*.a archive files (softlinks to the actual .a files)
  
    libValkka.so (my shared library)
  
  test/
  
    mytest.cpp
  
  bin/
  
    (binaries appear here)

  I’ve come a long way (see Including objects to a shared library from a C++ archive (.a) ) and the library compiles ok with this : ([STUFF] has been omitted for brevity)

  /usr/bin/c++ -fPIC -std=c++14 -pthread -Iinclude/ext -I/usr/include/libdrm -g -shared -Wl,-soname,libValkka.so -o lib/libValkka.so CMakeFiles/Valkka.dir/src/avthread.cpp.o CMakeFiles/Valkka.dir/src/opengl.cpp.o CMakeFiles/Valkka.dir/src/openglthread.cpp.o [STUFF] CMakeFiles/Valkka.dir/src/filters.cpp.o -lX11 -lGLEW -lGLU -lGL -Wl,—allow-multiple-definition -Wl,-Bsymbolic -Wl,—whole-archive -Wreorder lib/libavdevice.a lib/libavfilter.a lib/libavformat.a lib/libavcodec.a lib/libavutil.a lib/libswscale.a lib/libswresample.a -Wl,—no-whole-archive

  However, when creating executables - their source code does not use any ffmpeg api (just my own api) - with :

  c++ -std=c++14 -pthread -Iinclude -Iinclude/ext -Llib test/mytest.cpp -lValkka -g -o bin/mytest

  I get a hoard of errors about missing ffmpeg dependencies. Not everything is missing, just some weird stuff :

  lib/libValkka.so: undefined reference to `pa_stream_get_index'
  
  lib/libValkka.so: undefined reference to `deflateInit_'
  
  lib/libValkka.so: undefined reference to `pa_stream_get_state'
  
  lib/libValkka.so: undefined reference to `lzma_stream_decoder'
  
  lib/libValkka.so: undefined reference to `BZ2_bzDecompress'
  
  lib/libValkka.so: undefined reference to `vaInitialize'
  
  lib/libValkka.so: undefined reference to `pa_stream_unref'
  
  lib/libValkka.so: undefined reference to `deflateInit2_'
  
  lib/libValkka.so: undefined reference to `snd_pcm_close'
  
  ...
  
  lib/libValkka.so: undefined reference to `vaGetDisplayDRM'
  
  lib/libValkka.so: undefined reference to `vaMaxNumEntrypoints'
  
  lib/libValkka.so: undefined reference to `uncompress'
  
  lib/libValkka.so: undefined reference to `pa_stream_drop'
  
  lib/libValkka.so: undefined reference to `pa_context_connect'
  
  lib/libValkka.so: undefined reference to `FT_Get_Kerning'
  
  lib/libValkka.so: undefined reference to `ass_free_track'
  
  lib/libValkka.so: undefined reference to `pa_operation_unref'
  
  lib/libValkka.so: undefined reference to `FT_Stroker_Done'
  
  lib/libValkka.so: undefined reference to `vaTerminate'
  
  lib/libValkka.so: undefined reference to `ass_new_track'
  
  lib/libValkka.so: undefined reference to `jack_client_close'
  
  ...
  
  lib/libValkka.so: undefined reference to `xcb_xfixes_query_version'
  
  lib/libValkka.so: undefined reference to `xcb_shape_rectangles'
  
  lib/libValkka.so: undefined reference to `pa_mainloop_free'
  
  lib/libValkka.so: undefined reference to `snd_device_name_hint'
  
  lib/libValkka.so: undefined reference to `vaCreateImage'
  
  lib/libValkka.so: undefined reference to `vaBeginPicture'
  
  lib/libValkka.so: undefined reference to `DtsSetColorSpace'
  
  lib/libValkka.so: undefined reference to `vaDestroyConfig'
  
  lib/libValkka.so: undefined reference to `pa_stream_writable_size'
  
  lib/libValkka.so: undefined reference to `snd_pcm_hw_params_get_buffer_size_max'
  
  lib/libValkka.so: undefined reference to `ass_read_file'

  This is pretty frustrating, especially when I can see that those names are included in the shared library..!

  nm lib/libValkka.so | grep "vaBeginPicture"

  gives

  U vaBeginPicture

  etc. I thought it might be a problem regarding the dependency order the archive .a files, and also tried with :

  ..... -Wl,—allow-multiple-definition -Wl,-Bsymbolic -Wl,—start-group -Wl,—whole-archive -Wreorder lib/libavdevice.a lib/libavfilter.a lib/libavformat.a lib/libavcodec.a lib/libavutil.a lib/libswscale.a lib/libswresample.a -Wl,—no-whole-archive -Wl,—end-group

  But the problem persists.

  I have succesfully created a shared library that does not "bake in" those .a archives, i.e. that just depends dynamically on ffmpeg libraries, and there are no such problems.

  I am baffled.. Have I misunderstood something fundamental, forgot some annoying linked option, or both ? Help appreciated !

• Bad quality output with FFmpeg, bitrate specified [closed]

  28 septembre 2012, par Darkman2412

  I have a static background image where I add 2 videos on top of it using FFmpeg CLI. The output file (test.avi in this case), is very bad quality.

  ffmpeg -loop 1 -i outro.png
  
        -vf "movie='intro.mov' [last], [last]scale=512:288[scaled1], [in][scaled1] overlay=290:396 [tmp];
  
             movie='intro2.mov' [featured], [featured]scale=512:288[scaled2], [tmp][scaled2] overlay=1118:396 [out]" -b 512k -t 10 -r 30 -y test.avi

  The first image is the first frame of test.avi.
  The second one is what it should be.

  

  

  Edit : my question is why it's such bad quality.

  Edit2 : Console output :

  ffmpeg version N-44601-gcb3591e Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Sep 19 2012 16:31:43 with gcc 4.7.1 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-pthreads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      51. 73.101 / 51. 73.101
  
    libavcodec     54. 56.100 / 54. 56.100
  
    libavformat    54. 27.101 / 54. 27.101
  
    libavdevice    54.  2.100 / 54.  2.100
  
    libavfilter     3. 16.104 /  3. 16.104
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  [image2 @ 0000000001f4fa40] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  Input #0, image2, from 'outro.png':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, rgba64be, 1920x1080, 25 tbr, 25 tbn, 25 tbc
  
  Please use -q:a or -q:v, -qscale is ambiguous
  
  Output #0, avi, to 'test.avi':
  
    Metadata:
  
      ISFT            : Lavf54.27.101
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1920x1080, q=2-31, 200 kb/s, 30 tbn, 30 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png -> mpeg4)
  
  Press [q] to stop, [?] for help
  
  frame=    6 fps=0.0 q=2.0 size=      72kB time=00:00:00.23 bitrate=2527.9kbits/s    
  
  frame=   12 fps= 11 q=2.0 size=     115kB time=00:00:00.46 bitrate=2013.6kbits/s    
  
  frame=   18 fps= 11 q=2.0 size=     190kB time=00:00:00.70 bitrate=2223.8kbits/s    
  
  frame=   24 fps= 11 q=2.0 size=     235kB time=00:00:00.96 bitrate=1987.4kbits/s    
  
  frame=   30 fps= 11 q=2.0 size=     314kB time=00:00:01.20 bitrate=2142.8kbits/s    
  
  frame=   36 fps= 11 q=2.0 size=     368kB time=00:00:01.43 bitrate=2102.2kbits/s    
  
  frame=   42 fps= 11 q=2.0 size=     457kB time=00:00:01.66 bitrate=2247.6kbits/s    
  
  frame=   48 fps= 11 q=2.0 size=     510kB time=00:00:01.90 bitrate=2199.8kbits/s    
  
  frame=   54 fps= 11 q=2.0 size=     596kB time=00:00:02.16 bitrate=2253.9kbits/s    
  
  frame=   60 fps= 11 q=2.0 size=     649kB time=00:00:02.40 bitrate=2216.5kbits/s    
  
  frame=   66 fps= 11 q=2.0 size=     718kB time=00:00:02.63 bitrate=2232.9kbits/s    
  
  frame=   72 fps= 11 q=2.0 size=     779kB time=00:00:02.86 bitrate=2226.4kbits/s    
  
  frame=   78 fps= 11 q=2.0 size=     868kB time=00:00:03.10 bitrate=2293.0kbits/s    
  
  frame=   84 fps= 11 q=2.0 size=     956kB time=00:00:03.36 bitrate=2325.8kbits/s    
  
  frame=   90 fps= 11 q=2.0 size=    1049kB time=00:00:03.60 bitrate=2386.2kbits/s    
  
  frame=   96 fps= 11 q=2.0 size=    1143kB time=00:00:03.83 bitrate=2442.9kbits/s    
  
  frame=  101 fps= 11 q=2.0 size=    1224kB time=00:00:04.03 bitrate=2485.2kbits/s    
  
  frame=  106 fps= 10 q=2.0 size=    1259kB time=00:00:04.23 bitrate=2436.7kbits/s    
  
  frame=  111 fps= 10 q=2.0 size=    1326kB time=00:00:04.43 bitrate=2449.5kbits/s    
  
  frame=  116 fps= 10 q=2.0 size=    1355kB time=00:00:04.63 bitrate=2396.5kbits/s    
  
  frame=  121 fps= 10 q=2.0 size=    1409kB time=00:00:04.83 bitrate=2388.1kbits/s    
  
  frame=  127 fps= 10 q=2.0 size=    1424kB time=00:00:05.06 bitrate=2302.5kbits/s    
  
  frame=  133 fps= 10 q=2.0 size=    1480kB time=00:00:05.30 bitrate=2286.8kbits/s    
  
  frame=  139 fps= 10 q=2.0 size=    1497kB time=00:00:05.56 bitrate=2203.7kbits/s    
  
  frame=  145 fps= 10 q=2.0 size=    1552kB time=00:00:05.80 bitrate=2191.8kbits/s    
  
  frame=  151 fps= 10 q=2.0 size=    1567kB time=00:00:06.03 bitrate=2127.6kbits/s    
  
  frame=  157 fps= 10 q=2.0 size=    1621kB time=00:00:06.26 bitrate=2119.2kbits/s    
  
  frame=  163 fps= 10 q=2.0 size=    1641kB time=00:00:06.50 bitrate=2068.1kbits/s    
  
  frame=  169 fps= 10 q=2.0 size=    1710kB time=00:00:06.76 bitrate=2070.3kbits/s    
  
  frame=  175 fps= 10 q=2.0 size=    1750kB time=00:00:07.00 bitrate=2047.9kbits/s    
  
  frame=  181 fps= 10 q=2.0 size=    1834kB time=00:00:07.23 bitrate=2077.6kbits/s    
  
  frame=  187 fps= 10 q=2.0 size=    1876kB time=00:00:07.46 bitrate=2058.4kbits/s    
  
  frame=  193 fps= 10 q=2.0 size=    1962kB time=00:00:07.70 bitrate=2087.7kbits/s    
  
  frame=  199 fps= 10 q=2.0 size=    2005kB time=00:00:07.96 bitrate=2061.5kbits/s    
  
  frame=  205 fps= 10 q=2.0 size=    2088kB time=00:00:08.20 bitrate=2086.1kbits/s    
  
  frame=  211 fps= 10 q=2.0 size=    2126kB time=00:00:08.43 bitrate=2065.0kbits/s    
  
  frame=  217 fps= 10 q=2.0 size=    2201kB time=00:00:08.66 bitrate=2080.5kbits/s    
  
  frame=  223 fps= 10 q=2.0 size=    2230kB time=00:00:08.90 bitrate=2052.8kbits/s    
  
  frame=  229 fps= 10 q=2.0 size=    2293kB time=00:00:09.16 bitrate=2049.5kbits/s    
  
  frame=  235 fps= 10 q=2.0 size=    2307kB time=00:00:09.40 bitrate=2010.4kbits/s    
  
  frame=  241 fps= 10 q=2.0 size=    2366kB time=00:00:09.63 bitrate=2011.8kbits/s    
  
  frame=  247 fps= 10 q=2.0 size=    2409kB time=00:00:09.86 bitrate=2000.1kbits/s    
  
  frame=  250 fps= 10 q=2.0 Lsize=    2438kB time=00:00:10.00 bitrate=1997.2kbits/s    
  
  
  
  video:2425kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.523809%