On 05/12/16 12:51, Archer Chang wrote: > I use the VAAPI HW ACCEL to transcode file to the FLV format that the > command as follows. > > ffmpeg -vaapi_device /dev/dri/renderD128 -hwaccel vaapi > -hwaccel_output_format vaapi -hwaccel_lax_profile_check -i infile.mkv -vf > "format=nv12|vaapi,hwupload" -c:v h264_vaapi -c:a aac -ac 2 -ar 44100 > *outfile1.flv* > > The transcoded file(outfile.flv) only can hear the audio but no video that > played by the JW player. But when I transcode the file to the MKV and make > the stream copy to the FLV format and > this file can be played normally by the JW player. The command as follows. > > ffmpeg -vaapi_device /dev/dri/renderD128 -hwaccel vaapi > -hwaccel_output_format vaapi -hwaccel_lax_profile_check -i infile.mkv -vf > "format=nv12|vaapi,hwupload" -c:v h264_vaapi -c:a aac -ac 2 -ar 44100 > outfile.mkv > ffmpeg -i outfile.mkv -c:v copy -c:a copy *outfile2.flv* > > I try to use the flv parser utility to find out the difference between the > outfile1.flv and the outfile2.flv. > Seems the Video Tag1 were different. the content as follows. > > outfile1.flv (transcode using the ffmpeg directly with VAAPI) > 09 00 00 05 00 00 00 00 00 00 00 17 00 00 00 00 > > outfile2.flv(mke the stream copy from transcoded file) > 09 00 00 30 00 00 00 00 00 00 00 17 00 00 00 00 > 01 6E 00 28 FF E1 00 1A 67 6E 00 28 A6 CD 94 07 > 80 22 7E 5C 04 40 00 00 FA 40 00 2E E0 03 C6 0C > 65 80 01 00 06 68 EB E3 CB 22 C0 > > I not familiar with the video transcoding. I trace the flvenc.c seems the > par->extradata_size would be 0 when use the VAAPI to transcode the file to > the FLV directly, > And it has some value which makes stream copy or use SW transcode > > ffmpeg -i infile.mkv -c:v libx264 -c:a aac -ac 2 -ar 44100 *outfile.flv > (can be played normally by JW Player)*
Is this JW player something which can only play streams with global headers, then? If so, try applying <https://git.libav.org/?p=libav.git;a=commit;h=0cf86fabfa5820596cca2cfead63c6f8df76c3f2> and see if it works. (This is on the assumption that you are using a packed-header VAAPI driver like i965, if you are using a whole-stream driver like mesa/gallium then it isn't really fixable.) - Mark _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
