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![ffmpeg vcodec h264 ffmpeg vcodec h264](https://cdn.write.corbpie.com/wp-content/uploads/2020/01/ffmpeg-h264-preset-comparison-2020-crf-23-seconds-chart.png)
ffmpeg -vcodec h264_cuvid -i 1000_raw_data.h264 output.mp4.FFMPEG/libavcodec: 4.4.2 (installed from source, following Official Guide and Pytorch Guide.FFMPEG/libavcodec: 4.2.7 (installed using apt).So I think that maybe GPU H264 Codec is bugged, or there is some kind of H264 data format that GPU implementation cannot decode? I also ran a GPU H265 Decoder, and it can work well all day. I tried to use both libavcodec and ffmpeg application on two different servers and GPUs, and they seemed to perform similarly, failed to decode the same data, worked normally for the other. It didn’t always fail through, maybe approx 50% of input data. I found that codec h264_cuvid failed to decode on some data, while CPU implementation h264 / libx264 worked normally. My implementation is based on FFmpeg/decode_video.c at master If your input has a bit rate of up to 65,000 kBit/s, chances are it'll still look pretty good after conversion though.Hi. The default value here is 23, while values between 18 and 28 are considered sane. Try setting the -crf option to influence the constant quality parameter. Of course, reencoding the video will degrade its quality to some extent, given that you're applying a lossy conversion again. MediaInfo can also help you analyze container and codec details. You can check this while encoding, where x264 says something like: profile High, level 4.0 The output will have the correct profile and level set in its metadata.
![ffmpeg vcodec h264 ffmpeg vcodec h264](http://upload-images.jianshu.io/upload_images/1720840-1a5cf69e41b238cd.png)
Here we've just copied the audio stream since it won't be affected. -level:v – as defined in Annex A of the H.264 standard, e.g., 4.0.įor example: ffmpeg -i input.mp4 -c:v libx264 -profile:v high -level:v 4.0 -c:a copy output.mp4.-profile:v – one of high, main, or baseline (and others, but this is irrelevant here).When encoding with libx264, you can set the H.264 profile and level with:
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