-------- Weitergeleitete Nachricht --------
Betreff: Re: [FFmpeg-user] Remove black border on both up/down and
left/bottom
Datum: Fri, 23 May 2025 03:04:26 +0200
Von: Richard Bartczak <richard.bartc...@gmx.de>
An: Mark Filipak <markfilipak.i...@gmail.com>
Am 23.05.25 um 02:53 schrieb Mark Filipak:
On 22/05/2025 20.18, Richard Bartczak via ffmpeg-user wrote:
ffmpeg -i "1492-Die Eroberung des Paradieses.ts" -crf 0 -vf
scale=720x576,setsar=64/45,setdar=16/9 -c:a copy out.ts
=> bad quality, but speedx >= 8
-vf scale=720x576,setsar=64/45,setdar=16/9
You are causing the video steam to be decoded. You are then scaling
the pictures to 720x576 -- Why? You are then forcing SAR and DAR
before sending the pictures to the encoder. Since you don't specify an
encoder, the encoder is probably defaulting to MPEG2.
-crf 0
I've never used this bitstream function. Constant frame rate? Yes, it
probably is CFR, but why do you think you need to force it? Leave that
out.
** Oh, sorry. '-crf' is not constant frame rate.
Documentation says, "Set the quality/size tradeoff for
constant-quality (no bitrate target) and constrained-quality (with
maximum bitrate target) modes. Valid range is 0 to 63, higher numbers
indicating lower quality and smaller output size. Only used if set; by
default only the bitrate target is used."
That's too vague for me to figure out what it does.
Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv, bt470bg, top first), *720x576 [SAR 16:15 DAR 4:3]*, 25
fps, 25 tbr, 90k tbn
Your video is 768x576 -- seems like standard PAL to me. That should
play fine without doing anything. If you are getting black bars all
around on play, I'd say your player is not scaling it to 1440x1080. It
it was scaling it properly, it should also add black bars on the
sides, only, to bring it to 1920x1080 display.
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A description of crf you will find here :
https://trac.ffmpeg.org/wiki/Encode/H.265
But it does not work in the context of -vf only (as example here :
https://stackoverflow.com/questions/36966197/how-to-change-mp4-aspect-ratio-to-169-using-ffmpeg
,
second answer.).
Best regards
Richard
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