New submission from Reuben <[email protected]>: I realize that this is not tech support for Grassvalley, however from what I understand GrassValley created the spec for the GXF format, and hence their decoder / encoder is the reference implementation for GXF.
I'm trying to encode gxf files with ffmpeg for playback on GrassValley's "Turbo" playback machine. The files load correctly and play, however the playback stutters and jumps around. (Sounds similar to the problem reported in Issue 487, however in that case the scenario is reversed, encode with their software, poor playback with ffmpeg) Turbo provides a small CLI win32 app called tsstream to parse and check GXF files: http://www.gvgdevelopers.com/concrete/products/k2/tstream___gxf_file_parser_and_checker/ I'm using a fairly recent win32 build: SVN-r24796. I can test the output generated from a Linux build as well if that helps. I've tried to compress the video stream with mpeg2enc in case it was an video stream issue, but had similar results. I encoding with the intent to have the output adhere as close as possible to NTSC (30000/1001, 720x480, fields) using the following: ffmpeg.exe -i InputFile.ext -r 60000/1001 -s 720x480 -aspect 4:3 -an -f yuv4mpegpipe - | y4minterlace | ffmpeg.exe -i - -i %1 -map 0:0 -map 1:1.0 -map 1:1.1 -vcodec mpeg2video -r ntsc -flags +ilme+ildct+alt+gmc -top 1 -s 720x480 -aspect 4:3 -qscale 2 -threads 4 -acodec pcm_s16le -ac 1 -ar 48000 -f gxf OutputFile.gxf -acodec pcm_s16le -ac 1 -ar 48000 -newaudio I'll be uploading the source file, resulting gxf file and output from tstream when parsing the file. File 'tstream.log' not attached - you can download it from https://roundup.ffmpeg.org/file1032. ---------- files: tstream.log messages: 11701 priority: normal status: new substatus: new title: ffmpeg muxed GXF files do not play back on correctly on GrassValley Units type: bug ________________________________________________ FFmpeg issue tracker <[email protected]> <https://roundup.ffmpeg.org/issue2171> ________________________________________________
