Recherche avancée

Sur d’autres sites (9028)

• Why is ffmpeg trying to produce both h.264 as well as h.265 ?

  7 mars 2018, par hydra3333

  I think I only ask for h.265 output, but the output loge below seems to indicate it is trying to produce 2 video streams as output.

  "C:\SOFTWARE\ffmpeg\0-homebuilt-x64\built_for_generic_opencl\x64_8bit\ffmpeg.exe" -hide_banner -v verbose  -threads 0 -i "G:\HDTV\0nvencc\test-mp4-03\ABC HD interlaced.aac.mp4" -t 15 -threads 0 -an  -sws_flags lanczos+accurate_rnd+full_chroma_int+full_chroma_inp -filter_complex "[0:v]yadif=0:0:0" -pixel_format yuv420p -pix_fmt yuv420p -strict -1 -f yuv4mpegpipe - 2> .\zzz1.h265.txt 
  
  | "C:\SOFTWARE\ffmpeg\0-homebuilt-x64\built_for_generic_opencl\x64_8bit\ffmpeg.exe" -strict -1 -hide_banner -v verbose  -threads 0 -i - -strict -1 -c:v:0 libx265 -crf 28 output.mp4 -an  -y .\zzz.h265.mp4 2> .\zzz2.h265.txt 
  
  
  
  -----------------------------
  
  <snip to="to" make="make" code="code" block="block" smaller="smaller">
  
      Stream mapping:
  
        Stream #0:0 (h264) -> yadif
  
        yadif -> Stream #0:0 (wrapped_avframe)
  
      Press [q] to stop, [?] for help
  
      [h264 @ 000001b78ca87c00] Reinit context to 1920x1088, pix_fmt: yuv420p
  
      [graph 0 input from stream 0:0 @ 000001b78ca264c0] w:1920 h:1080 pixfmt:yuv420p tb:1/90000 fr:25/1 sar:1/1 sws_param:flags=2
  
  </snip>

  Output file #0 (pipe:):
  
    Output stream #0:0 (video): 2 frames encoded; 2 packets muxed (1072 bytes); 
  
    Total: 2 packets (1072 bytes) muxed
  
  Conversion failed!
  
  -----------------------------
  
  Routing option strict to both codec and muxer layer
  
      Last message repeated 1 times
  
  Input #0, yuv4mpegpipe, from 'pipe:':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: rawvideo, 1 reference frame (I420 / 0x30323449), yuv420p(progressive, left), 1920x1080, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> hevc (libx265))
  
    Stream #0:0 -> #1:0 (rawvideo (native) -> h264 (libx264))
  
  [graph 0 input from stream 0:0 @ 0000027f5ebefa00] w:1920 h:1080 pixfmt:yuv420p tb:1/25 fr:25/1 sar:1/1 sws_param:flags=2
  
  x265 [info]: HEVC encoder version 2.7613d9f443769
  
  x265 [info]: build info [Windows][GCC 7.3.0][64 bit] 8bit
  
  x265 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  x265 [info]: Main profile, Level-4 (Main tier)
  
  x265 [info]: Thread pool created using 8 threads
  
  x265 [info]: Slices                              : 1
  
  x265 [info]: frame threads / pool features       : 3 / wpp(17 rows)
  
  -----------------------------

• Stack AVFrame side by side (libav/ffmpeg)

  22 février 2018, par dronemastersaga

  So I am trying to combine two H264 livestreams of 1920x1080 resolution side-by-side to a livestream of 3840x1080 resolution.

  For this, I can decode streams to AVFrames in libav/FFmpeg that I would like to combine into a bigger frame. The Input AVFrames : Two 1920x1080 frames in NV12 format (description : planar YUV 4:2:0, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (first byte U and the following byte V))

  The way I have figured out is with colorspace conversion (YUV to BGR) in libav, then to change it to OpenCV Mat, then to use hconcat in OpenCV to stack together, then colorspace conversion (BGR to YUV) in AVFormat.

  Below is the method currently being used :

  //Prior code is too long: Basically it decodes 2 streams to AVFrames frame1 and frame2 in a loop
  
  sws_scale(swsContext, (const uint8_t *const *) frame1->data, frame1->linesize, 0, 1080, (uint8_t *const *) frameBGR1->data, frameBGR1->linesize);
  
  sws_scale(swsContext, (const uint8_t *const *) frame2->data, frame2->linesize, 0, 1080, (uint8_t *const *) frameBGR2->data, frameBGR2->linesize);
  
  Mat matFrame1(1080, 1920, CV_8UC3, frameBGR1->data[0], (size_t) frameBGR1->linesize[0]);
  
  Mat matFrame2(1080, 1920, CV_8UC3, frameBGR2->data[0], (size_t) frameBGR2->linesize[0]);
  
  Mat fullFrame;
  
  hconcat(matFrame1, matFrame2, fullFrame);
  
  const int stride[] = { static_cast<int>(fullFrame.step[0]) };
  
  sws_scale(modifyContext, (const uint8_t * const *)&amp;fullFrame.data, stride, 0, fullFrame.rows, newFrame->data, newFrame->linesize);
  
  //From here, newFrame is sent to the encoder
  
  </int>

  The resulting image is satisfactory but it does lose quality in colorspace conversion. However this method is too slow to use (I’m at 15 fps and I need 30). Is there a way to stack AVFrames directly without colorspace conversion ? Or is there any better way to do this ? I searched a lot about this and I couldn’t find any solution to this. Please advise.

• FFMPEG, resize and pad a video by and odd number of pixels ?

  18 février 2018, par Jules

  I’m trying to resize and pad a video from 1917 x 1080 to 1920 x 1080.

  I’ve tried various syntax, which works but doesn’t change the size.

  ffmpeg -i input.mp4 -filter:v scale=1920:1080,pad=1920:1080 -c:a copy output.mp4

  However, I have go to this point by resize, joint audio and rotate. The initial size is 640 x 1136, I believe this is the source of the problem.

  ffmpeg -i input.mp4 -filter:v scale=900:1200 -c:a copy output.mp4
  
  
  
  ffmpeg \
  
  -i input.m4a \
  
  -i resize.mp4 -acodec copy -vcodec copy -shortest \
  
  output.mp4
  
  
  
  ffmpeg -i input.mp4" -vf "transpose=2" output/mp4

  So I’m wondering if I should do something different earlier