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我在收到视频转换后的消息Invalid and inefficient vfw-avi packed B frames detected。检测到无效且效率低的vfw-avi打包B帧
转换视频后，我检查了视频中的像素值。值与原始视频不同。转换后为什么值会改变？
和我使用无损帧内视频编解码器 'FFV1'
命令： 的ffmpeg -i input_video -vcodec FFV1 -acodec pcm_s16le output_video
ffmpeg version 1.1.1 Copyright (c) 2000-2013 the FFmpeg developers
built on Jan 20 2013 23:05:28 with gcc 4.7.2 (GCC) configuration:
--enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib libavutil 52. 13.100/52. 13.100 libavcodec 54. 86.100/54. 86.100 libavformat 54. 59.106/54. 59.106 libavdevice 54. 3.102/54. 3.102 libavfilter 3. 32.100/3. 32.100 libswscale 2. 1.103/
2. 1.103 libswresample 0. 17.102/0. 17.102 libpostproc 52. 2.100/52. 2.100 [mpeg4 @ 02e218c0] Invalid and inefficient vfw-avi packed B frames detected Input #0, avi, from
'D:\video_output\avi\1.avi': Metadata:
encoder : Lavf54.59.106 Duration: 00:04:25.52, start: 0.000000, bitrate: 2744 kb/s
Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (DX50/0x30355844), yuv420p, 720x544 [SAR 1:1 DAR 45:34], 25 tbr, 25 tbn, 25
tbc
Stream #0:1: Audio: ac3 ([0] [0][0]/0x2000), 48000 Hz, stereo, fltp, 192 kb/s Output #0, matroska, to 'D:\video_output\avi\1_2.mkv':
Metadata:
encoder : Lavf54.59.106
Stream #0:0: Video: ffv1 (FFV1/0x31564646), yuv420p, 720x544 [SAR 1:1 DAR 45:34], q=2-31, 200 kb/s, 1k tbn, 25 tbc
Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s Stream mapping: Stream #0:0 -> #0:0 (mpeg4 -> ffv1) Stream #0:1 ->
#0:1 (ac3 -> pcm_s16le) Press [q] to stop, [?] for help [mpeg4 @ 02e27920] Invalid and inefficient vfw-avi packed B frames detected
frame= 36 fps=0.0 q=0.0 size= 1916kB time=00:00:01.56
bitrate=10008.5kbits/s
...
frame= 6565 fps= 46 q=0.0 size= 862611kB time=00:04:22.72
bitrate=26897.5kbits/s frame= 6594 fps= 46 q=0.0 size= 864799kB
time=00:04:23.87 bitrate=26848.0kbits/s frame CRC mismatch frame=
6629 fps= 46 q=0.0 size= 866407kB time=00:04:25.20
bitrate=26763.2kbits/s frame= 6638 fps= 46 q=0.0 Lsize= 866521kB
time=00:04:25.56 bitrate=26730.5kbits/s
video:816725kB audio:49668kB subtitle:0 global headers:0kB muxing
overhead 0.014713%
C++代码
void ProcessVideo::processFrame1(string fileName1, string fileName2) {
this->capture.open(fileName1);
if (!this->capture.isOpened())
cout<<"video1 error";
get_videoInfo();
set_videoInfo();
this->capture1.open(fileName2);
if (!this->capture1.isOpened())
cout<<"video2 error";
cv::Mat frame; // current video frame
cv::Mat frame1; // current video frame
cv::namedWindow("image1");
cv::namedWindow("image2");
int count = 0;
int count1 = 0;
while (1) {
capture >> frame;
capture1 >> frame1;
if (frame.empty()) {
//break;
cout<<"Frame1 Empty"<<endl;
}
cv::Mat_<cv::Vec3b>::iterator it=frame.begin<cv::Vec3b>();
cv::Mat_<cv::Vec3b>::iterator itend=frame.end<cv::Vec3b>();
if (frame1.empty()) {
//break;
cout<<"Frame2 Empty"<<endl;
}
cv::Mat_<cv::Vec3b>::iterator it1=frame1.begin<cv::Vec3b>();
cv::Mat_<cv::Vec3b>::iterator itend1=frame1.end<cv::Vec3b>();
if(frame.empty() && frame1.empty()) {
break;
}
count1++;
int i=0,j=0,k=0;
while(it!=itend && it1!=itend1) {
++it;
++it1;
count++;
if((*it)[0] != (*it1)[0]){
i++;
}
else if((*it)[1] != (*it1)[1]){
j++;
}
else if((*it)[2] != (*it1)[2]){
k++;
}
}
cout<<"count diffrent pixel : "<<i<<"\t"<<j<<"\t"<<k<<"\t";
cout<<"\n------------------------"<<count1<<"finish frame-----------------------\n"<<endl;
cv::imshow("image1", frame);
cv::imshow("image2", frame1);
cv::waitKey(1);
}
this->capture.release();
this->capture1.release();
}
您正在使用的工具？分享你的代码..提到产生这个错误的步骤。并访问http://stackoverflow.com/help/on-topic – Paritosh
你忘了包括你的ffmpeg命令。你怎么知道“像素值”改变了？ – LordNeckbeard
您的程序是否使用与ffmpeg相同的divx解码器？我想我记得h.264声称对它使用的DCT有一个确切的定义是一个特征，因为它使得通过不同解码器的比特精确解码是必需的。 （哪个divx没有，部分原因是在解码和使用帧作为参考之间的循环中没有解块滤波器）。您发布的代码片段不够完整，无法让任何人自行编译和尝试。 –