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Sur d’autres sites (7269)

  • python imageio.get_reader() returns format error

    19 août 2020, par tristan_jia
    import imageio

reader = imageio.get_reader("./t.mp4")


    


    As shown above, with python 3.6.10, it returns :

    


    >>> reader = imageio.get_reader("../")&#xA;Traceback (most recent call last):&#xA;  File "<stdin>", line 1, in <module>&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/core/functions.py", line 129, in get_reader&#xA;    return format.get_reader(request)&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/core/format.py", line 168, in get_reader&#xA;    return self.Reader(self, request)&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/core/format.py", line 217, in __init__&#xA;    self._open(**self.request.kwargs.copy())&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 357, in _open&#xA;    self._initialize()&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 430, in _initialize&#xA;    shell=ISWIN)&#xA;  File "/usr/lib64/python3.6/subprocess.py", line 729, in __init__&#xA;    restore_signals, start_new_session)&#xA;  File "/usr/lib64/python3.6/subprocess.py", line 1364, in _execute_child&#xA;    raise child_exception_type(errno_num, err_msg, err_filename)&#xA;OSError: [Errno 8] Exec format error: &#x27;/home/tristan_jia/.imageio/ffmpeg/ffmpeg-linux64-v3.3.1&#x27;&#xA;&#xA;</module></stdin>

    &#xA;

    I searched everywhere but haven't seen any similar questions. The script runs on Opensuse Leap 15.1, is it related to the system I use ?

    &#xA;

  • arm : Consistently use proper interworking function returns

    3 octobre 2024, par Martin Storsjö
    arm : Consistently use proper interworking function returns

    Use "bx lr", or "pop lr", which do proper mode switching
    
between thumb and arm modes. A plain "mov pc, lr" does not switch
    
from thumb mode to arm mode (while in arm mode, it does switch
    
mode for a thumb caller).
    

    This is normally not an issue, as CONFIG_THUMB only is enabled if
    
the C compiler defaults to thumb ; but stick to patterns that can
    
do mode switching if needed, for consistency.
    

    Signed-off-by : Martin Storsjö <martin@martin.st>
    • [DH] libswresample/arm/resample.S
    • [DH] libswscale/arm/hscale.S
    • [DH] libswscale/arm/output.S
    • [DH] libswscale/arm/yuv2rgb_neon.S

  • Using ffmpeg avcodec_decode_video2 got_picture_ptr returns 0

    3 septembre 2014, par kaiken

    I’m trying to playback the gopro live feed which consists of a series of very short .ts files encoded using H264. I tested it on videos with different containers (mkv,avi,mp4) and different codecs (MPEG4, H264, MSVIDEO1). However, the files from the gopro always returns got_picture_ptr as 0 from avcodec_decode_video2 while the function returns the packet’s size. If I use ffplay or vlc it play the file without problem. I’m not sure what I’m doing wrong. I’m not very experienced with ffmpeg or video in general.

    Here is my test code. I based it off of this tutorial which is out of date but I was able to update the depreciated functions.

    AVFormatContext *pFormatCtx = NULL;
    
AVCodecContext *pCodecCtx;
    
AVStream *pStream = NULL;
    
int videoStream;
    
AVCodec *pCodec;
    
AVFrame *pFrame=NULL, *pFrameRGB=NULL;
    
HBITMAP membmp;
    
int widht,height;
    
BYTE *membits;
    
int frameFinished;
    
AVPacket packet;
    
img_convert_ctx = NULL;
    
uint8_t *buffer;
    
int numBytes;
    

    
// Open video file
    
if(avformat_open_input(&amp;pFormatCtx,params->fname,NULL,NULL)!=0)
    
   return -1;
    
// Retrieve stream information
    
if(avformat_find_stream_info(pFormatCtx,NULL)&lt;0)
    
   return -1;
    
//av_dump_format(pFormatCtx, 0, path, 0);
    

    
// Find the first video stream
    
for(int i=0; inb_streams; i++)
    
   if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
    
   {
    
      pStream=pFormatCtx->streams[i];
    
      videoStream = i;
    
      break;
    
   }
    
if(pStream==NULL)
    
   return -1; // Didn't find a video stream
    

    
// Get a pointer to the codec context for the video stream
    
pCodecCtx=pStream->codec;
    

    
// Find the decoder for the video stream
    
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
    
if(pCodec==NULL) {
    
   fprintf(stderr, "Unsupported codec!\n");
    
   return -1; // Codec not found
    
}
    

    
// Open codec
    
if(avcodec_open2(pCodecCtx, pCodec, NULL)&lt;0)
    
   return -1;
    

    
// Allocate an AVFrame structure
    
pFrame=avcodec_alloc_frame();
    
pFrameRGB=avcodec_alloc_frame();
    
if(pFrameRGB==NULL)
    
   return -1;
    

    
MakeBitmap(*params->memdc,membmp,(void**)&amp;membits,pCodecCtx->width,pCodecCtx->height);
    
// Assign appropriate parts of buffer to image planes in pFrameRGB
    
// Note that pFrameRGB is an AVFrame, but AVFrame is a superset
    
// of AVPicture
    
avpicture_fill((AVPicture *)pFrameRGB, membits, PIX_FMT_RGB24,
    
               pCodecCtx->width, pCodecCtx->height);
    

    
while (av_read_frame(pFormatCtx, &amp;packet) >= 0)
    
{
    
    // Is this a packet from the video stream?
    
    if (packet.stream_index == videoStream)
    
    {
    
        // Decode video frame
    
        int bytesUsed = avcodec_decode_video2(pCodecCtx, pFrame, &amp;frameFinished, &amp;packet);
    
        // Did we get a video frame?
    
        if(frameFinished)
    
        {
    
           //Do stuff with frame
    
        }
    
    }
    
    // Free the packet that was allocated by av_read_frame
    
    av_free_packet(&amp;packet);
    
    //if(i++>500)
    
    //   break;
    
}
    
DeleteObject(membmp);
    

    

    
// Free the frames
    
av_free(pFrameRGB);
    
av_free(pFrame);
    
// Close the codec
    
avcodec_close(pCodecCtx);
    
// Close the video file
    
avformat_close_input(&amp;pFormatCtx);
    

    
return  -1;

    For reference I’m doing this on Windows with the versions of the dlls :

    • avcodec-56.dll
    • avdevice-56.dll
    • avfilter-5.dll
    • avformat-56.dll
    • avutil-54.dll
    • postproc-53.dll
    • swresample-1.dll
    • swscale-3.dll

    and sample video file https://www.dropbox.com/s/htlinnv3qk5dfiu/amba_hls-2.ts?dl=0

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