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• jpg images to gif ffmpeg no data found in image

  3 juillet 2023, par Idk123

  I was trying to use ffmpeg to create a gif from jpg images, but I wasn't able to convert them, not through a python code and not even from the dir itself in cmd

  


  running cmd in the folder :

  


  python code :

  


  input_files = f"{BASE_DIR}\\qr_images\\qr%d.jpg"
command = f'ffmpeg -i {input_files} output.gif'
os.system(f'start /wait cmd /k {command}')


  


  the dir

  


  I need the files in the dir to be able to convert to gif using ffmpeg (I have it installed correctly)

  


  this is the complete cmd dialog (if I run it from the dir in cmd or if i run the python code :

  


  ffmpeg version 6.0-essentials_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers built with gcc 12.2.0 (Rev10, Built by MSYS2 project) 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-zlib —enable-libsrt —enable-libssh —enable-libzmq —enable-avisynth —enable-sdl2 —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxvid —enable-libaom —enable-libopenjpeg —enable-libvpx —enable-mediafoundation —enable-libass —enable-libfreetype —enable-libfribidi —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-libgme —enable-libopenmpt —enable-libopencore-amrwb —enable-libmp3lame —enable-libtheora —enable-libvo-amrwbenc —enable-libgsm —enable-libopencore-amrnb —enable-libopus —enable-libspeex —enable-libvorbis —enable-librubberband 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 [mjpeg @ 000002000696bfc0] No JPEG data found in image [mjpeg @ 000002000696bfc0] unable to decode APP fields : Invalid data found when processing input
Last message repeated 1 times [mjpeg @ 000002000696bfc0] No JPEG data found in image [mjpeg @ 000002000696bfc0] unable to decode APP fields : Invalid data found when processing input
Last message repeated 1 times [mjpeg @ 000002000696bfc0] Found EOI before any SOF, ignoring [mjpeg @ 000002000696bfc0] No JPEG data found in image [mjpeg @ 000002000696bfc0] bits 159 is invalid [mjpeg @ 000002000696bfc0] unable to decode APP fields : Invalid data found when processing input
Last message repeated 2 times [mjpeg @ 000002000696bfc0] bits 247 is invalid [mjpeg @ 000002000696bfc0] unable to decode APP fields : Invalid data found when processing input [mjpeg @ 000002000696bfc0] No JPEG data found in image [mjpeg @ 000002000696bfc0] unable to decode APP fields : Invalid data found when processing input [mjpeg @ 000002000696bfc0] No JPEG data found in image [image2 @ 000002000696aec0] Could not find codec parameters for stream 0 (Video : mjpeg (Progressive), none(bt470bg/unknown/unknown)) : unspecified size Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options Input #0, image2, from 'c :\Test_proj\qr_images\qr%d.jpg' : Duration : 00:00:00.28, start :
0.000000, bitrate : N/A Stream #0:0 : Video : mjpeg (Progressive), none(bt470bg/unknown/unknown), 25 fps, 25 tbr, 25 tbn Stream mapping : Stream #0:0 -> #0:0 (mjpeg (native) -> gif (native)) Press [q] to stop, [?] for help [mjpeg @ 00000200069a35c0] mjpeg : unsupported coding type (c5) [mjpeg @ 00000200069a35c0] mjpeg : unsupported coding type (ca) Error while decoding stream #0:0 : Invalid data found when processing input [mjpeg @ 00000200069a35c0] unable to decode APP fields : Invalid data found when processing input
Last message repeated 1 times [mjpeg @ 00000200069a35c0] mjpeg : unsupported coding type (ce) [mjpeg @ 00000200069a35c0] No JPEG data found in image Error while decoding stream #0:0 : Invalid data found when processing input [mjpeg @ 00000200069a35c0] unable to decode APP fields : Invalid data found when processing input
Last message repeated 1 times [mjpeg @ 00000200069a35c0] mjpeg : unsupported coding type (cb) [mjpeg @ 00000200069a35c0] Found EOI before any SOF, ignoring [mjpeg @ 00000200069a35c0] Can not process SOS before SOF, skipping [mjpeg @ 00000200069a35c0] No JPEG data found in image Error while decoding stream #0:0 : Invalid data found when processing input [mjpeg @ 00000200069a35c0] bits 159 is invalid Error while decoding stream #0:0 : Invalid data found when processing input [mjpeg @ 00000200069a35c0] unable to decode APP fields : Invalid data found when processing input
Last message repeated 2 times [mjpeg @ 00000200069a35c0] bits 247 is invalid Error while decoding stream #0:0 : Invalid data found when processing input [mjpeg @ 00000200069a35c0] unable to decode APP fields : Invalid data found when processing input [mjpeg @ 00000200069a35c0] mjpeg : unsupported coding type (c6) [mjpeg @ 00000200069a35c0] No JPEG data found in image Error while decoding stream #0:0 : Invalid data found when processing input [mjpeg @ 00000200069a35c0] Can not process SOS before SOF, skipping [mjpeg @ 00000200069a35c0] unable to decode APP fields : Invalid data found when processing input [mjpeg @ 00000200069a35c0] Can not process SOS before SOF, skipping
Last message repeated 2 times [mjpeg @ 00000200069a35c0] No JPEG data found in image Error while decoding stream #0:0 : Invalid data found when processing input Cannot determine format of input stream 0:0 after EOF Error marking filters as finished Conversion failed !

  


• using ffmpeg in C : system() or C api ?

  5 décembre 2018, par toastedDeli

  I want to use ffmpeg’s transcoding features multiple times in my program. This can be achieved by doing

  ffmpeg -i input output

  in a terminal. I believe I can use some shell or C code to execute these commands programmatically.

  I could also directly use ffmpeg’s c libraries to do this. My question is, will there be a noticeable performance difference between the 2 approaches ? Obviously the first will be simpler to implement, but will I pay a big performance cost ?

• Compatibility of P-frames and multithreading in FFmpeg library in C

  16 mai 2023, par Rachel

  I am working on a video processing project using the FFmpeg library in C. I would like to inquire about the compatibility and support for utilizing P-frames (predictive frames) and multithreading simultaneously in FFmpeg. Currently, I am exploring two options for achieving multithreading with FFmpeg :

  


  

  1. Setting the i_threads parameter of FFmpeg to a value greater than 1.

  


  2. My application opens multiple threads, where each thread creates a codec context
and performs parallel compression/decompression of frames from a shared FIFO.

  


  


  I have tried option 1, but I did not observe any noticeable time difference compared to using only one thread. I am seeking an understanding of why this might be the case.

  


  I have tried option 2, which has resulted in improved compression/decompression times for the frames. However, I would like to understand why does it work. Since I am utilizing P-Frames, where each P-frame depends on the latest I-Frame, how can I ensure that the decompression of P-Frames starts after the I-Frame has finished processing when dealing with multiple codec contexts ?

  


  I have two proceccses one for encodeing and one for decoding.
I'd like to improve times using threads in both of them.

  


  The encoder process code :

  


  pt_handle->t_x264_param.i_threads = 24;

  


  pt_handle->pt_x264_encoder = x264_encoder_open(&pt_handle->t_x264_param);

  


  The decoder process code :

  


  pt_handle->pt_avcodec_ctx->thread_count = 23;

  


  pt_handle->pt_avcodec_ctx->thread_type = FF_THREAD_FRAME ;

  


  i_retval = avcodec_open2(pt_handle->pt_avcodec_ctx, pt_h264_decoder, NULL);